在Python的3文档比Python的2文档更清晰一点：
str.isdigit()
数字包括十进制字符和需要特殊处理的数字，例如兼容性上标数字。形式上，数字是具有属性值Numeric_Type =数字或Numeric_Type
=十进制的字符。str.isnumeric()
数字字符包括数字字符，以及所有具有Unipre数值属性的字符，例如U + 2155，VULGAR FRACTION IF
FTHTH。形式上，数字字符是具有属性值Numeric_Type =数字，Numeric_Type =十进制或Numeric_Type =数字的字符。
因此，
isnumeric()还要额外测试Numeric_Type =
Numeric。引用有关官方数字类型定义的历史性建议：
Numeric_Type =十进制
位置十进制系统中使用的字符，标准十进制基数系统使用连续的数字0..9，并且最高有效数字在前（后备存储顺序）。根据定义，它们与General_Category
= Decimal_Number共同扩展。Numeric_Type =数字 位置小数字符（Numeric_Type
=小数）或其序列的变体。这些包括上标/下标，使用括号，点或逗号等字符将其括起来或修饰。Numeric_Type = 具有数字值的 数字 字符，但既不是十进制也不是数字。
因此，任何数字字符，但 不是 十进制或其变体。考虑分数，罗马数字， 组合 数字的字形以及任何非基于小数的编号系统。
包括了：
>>> import unipredata>>> for prepoint in range(2**16):... chr = unichr(prepoint)... if chr.isnumeric() and not chr.isdigit():... print u'{:04x}: {} ({})'.format(prepoint, chr, unipredata.name(chr, 'UNNAMED'))... 00bc: ¼ (VULGAR FRACTION ONE QUARTER)00bd: ½ (VULGAR FRACTION ONE HALF)00be: ¾ (VULGAR FRACTION THREE QUARTERS)09f4: ৴ (BENGALI CURRENCY NUMERATOR ONE)09f5: ৵ (BENGALI CURRENCY NUMERATOR TWO)09f6: ৶ (BENGALI CURRENCY NUMERATOR THREE)09f7: ৷ (BENGALI CURRENCY NUMERATOR FOUR)09f8: ৸ (BENGALI CURRENCY NUMERATOR ONE LESS THAN THE DENOMINATOR)09f9: ৹ (BENGALI CURRENCY DENOMINATOR SIXTEEN)0bf0: ௰ (TAMIL NUMBER TEN)0bf1: ௱ (TAMIL NUMBER ONE HUNDRED)0bf2: ௲ (TAMIL NUMBER ONE THOUSAND)0c78: ౸ (TELUGU FRACTION DIGIT ZERO FOR ODD POWERS OF FOUR)0c79: ౹ (TELUGU FRACTION DIGIT ONE FOR ODD POWERS OF FOUR)0c7a: ౺ (TELUGU FRACTION DIGIT TWO FOR ODD POWERS OF FOUR)0c7b: ౻ (TELUGU FRACTION DIGIT THREE FOR ODD POWERS OF FOUR)0c7c: ౼ (TELUGU FRACTION DIGIT ONE FOR EVEN POWERS OF FOUR)0c7d: ౽ (TELUGU FRACTION DIGIT TWO FOR EVEN POWERS OF FOUR)0c7e: ౾ (TELUGU FRACTION DIGIT THREE FOR EVEN POWERS OF FOUR)0d70: ൰ (MALAYALAM NUMBER TEN)0d71: ൱ (MALAYALAM NUMBER ONE HUNDRED)0d72: ൲ (MALAYALAM NUMBER ONE THOUSAND)0d73: ൳ (MALAYALAM FRACTION ONE QUARTER)0d74: ൴ (MALAYALAM FRACTION ONE HALF)0d75: ൵ (MALAYALAM FRACTION THREE QUARTERS)0f2a: ༪ (TIBETAN DIGIT HALF ONE)0f2b: ༫ (TIBETAN DIGIT HALF TWO)0f2c: ༬ (TIBETAN DIGIT HALF THREE)0f2d: ༭ (TIBETAN DIGIT HALF FOUR)0f2e: ༮ (TIBETAN DIGIT HALF FIVE)0f2f: ༯ (TIBETAN DIGIT HALF SIX)0f30: ༰ (TIBETAN DIGIT HALF SEVEN)0f31: ༱ (TIBETAN DIGIT HALF EIGHT)0f32: ༲ (TIBETAN DIGIT HALF NINE)0f33: ༳ (TIBETAN DIGIT HALF ZERO)1372: ፲ (ETHIOPIC NUMBER TEN)1373: ፳ (ETHIOPIC NUMBER TWENTY)1374: ፴ (ETHIOPIC NUMBER THIRTY)1375: ፵ (ETHIOPIC NUMBER FORTY)1376: ፶ (ETHIOPIC NUMBER FIFTY)1377: ፷ (ETHIOPIC NUMBER SIXTY)1378: ፸ (ETHIOPIC NUMBER SEVENTY)1379: ፹ (ETHIOPIC NUMBER EIGHTY)137a: ፺ (ETHIOPIC NUMBER NINETY)137b: ፻ (ETHIOPIC NUMBER HUNDRED)137c: ፼ (ETHIOPIC NUMBER TEN THOUSAND)16ee: ᛮ (RUNIC ARLAUG SYMBOL)16ef: ᛯ (RUNIC TVIMADUR SYMBOL)16f0: ᛰ (RUNIC BELGTHOR SYMBOL)17f0: ៰ (KHMER SYMBOL LEK ATTAK SON)17f1: ៱ (KHMER SYMBOL LEK ATTAK MUOY)17f2: ៲ (KHMER SYMBOL LEK ATTAK PII)17f3: ៳ (KHMER SYMBOL LEK ATTAK BEI)17f4: ៴ (KHMER SYMBOL LEK ATTAK BUON)17f5: ៵ (KHMER SYMBOL LEK ATTAK PRAM)17f6: ៶ (KHMER SYMBOL LEK ATTAK PRAM-MUOY)17f7: ៷ (KHMER SYMBOL LEK ATTAK PRAM-PII)17f8: ៸ (KHMER SYMBOL LEK ATTAK PRAM-BEI)17f9: ៹ (KHMER SYMBOL LEK ATTAK PRAM-BUON)2150: ⅐ (VULGAR FRACTION ONE SEVENTH)2151: ⅑ (VULGAR FRACTION ONE NINTH)2152: ⅒ (VULGAR FRACTION ONE TENTH)2153: ⅓ (VULGAR FRACTION ONE THIRD)2154: ⅔ (VULGAR FRACTION TWO THIRDS)2155: ⅕ (VULGAR FRACTION ONE FIFTH)2156: ⅖ (VULGAR FRACTION TWO FIFTHS)2157: ⅗ (VULGAR FRACTION THREE FIFTHS)2158: ⅘ (VULGAR FRACTION FOUR FIFTHS)2159: ⅙ (VULGAR FRACTION ONE SIXTH)215a: ⅚ (VULGAR FRACTION FIVE SIXTHS)215b: ⅛ (VULGAR FRACTION ONE EIGHTH)215c: ⅜ (VULGAR FRACTION THREE EIGHTHS)215d: ⅝ (VULGAR FRACTION FIVE EIGHTHS)215e: ⅞ (VULGAR FRACTION SEVEN EIGHTHS)215f: ⅟ (FRACTION NUMERATOR ONE)2160: Ⅰ (ROMAN NUMERAL ONE)2161: Ⅱ (ROMAN NUMERAL TWO)2162: Ⅲ (ROMAN NUMERAL THREE)2163: Ⅳ (ROMAN NUMERAL FOUR)2164: Ⅴ (ROMAN NUMERAL FIVE)2165: Ⅵ (ROMAN NUMERAL SIX)2166: Ⅶ (ROMAN NUMERAL SEVEN)2167: Ⅷ (ROMAN NUMERAL EIGHT)2168: Ⅸ (ROMAN NUMERAL NINE)2169: Ⅹ (ROMAN NUMERAL TEN)216a: Ⅺ (ROMAN NUMERAL ELEVEN)216b: Ⅻ (ROMAN NUMERAL TWELVE)216c: Ⅼ (ROMAN NUMERAL FIFTY)216d: Ⅽ (ROMAN NUMERAL ONE HUNDRED)216e: Ⅾ (ROMAN NUMERAL FIVE HUNDRED)216f: Ⅿ (ROMAN NUMERAL ONE THOUSAND)2170: ⅰ (SMALL ROMAN NUMERAL ONE)2171: ⅱ (SMALL ROMAN NUMERAL TWO)2172: ⅲ (SMALL ROMAN NUMERAL THREE)2173: ⅳ (SMALL ROMAN NUMERAL FOUR)2174: ⅴ (SMALL ROMAN NUMERAL FIVE)2175: ⅵ (SMALL ROMAN NUMERAL SIX)2176: ⅶ (SMALL ROMAN NUMERAL SEVEN)2177: ⅷ (SMALL ROMAN NUMERAL EIGHT)2178: ⅸ (SMALL ROMAN NUMERAL NINE)2179: ⅹ (SMALL ROMAN NUMERAL TEN)217a: ⅺ (SMALL ROMAN NUMERAL ELEVEN)217b: ⅻ (SMALL ROMAN NUMERAL TWELVE)217c: ⅼ (SMALL ROMAN NUMERAL FIFTY)217d: ⅽ (SMALL ROMAN NUMERAL ONE HUNDRED)217e: ⅾ (SMALL ROMAN NUMERAL FIVE HUNDRED)217f: ⅿ (SMALL ROMAN NUMERAL ONE THOUSAND)2180: ↀ (ROMAN NUMERAL ONE THOUSAND C D)2181: ↁ (ROMAN NUMERAL FIVE THOUSAND)2182: ↂ (ROMAN NUMERAL TEN THOUSAND)2185: ↅ (ROMAN NUMERAL SIX LATE FORM)2186: ↆ (ROMAN NUMERAL FIFTY EARLY FORM)2187: ↇ (ROMAN NUMERAL FIFTY THOUSAND)2188: ↈ (ROMAN NUMERAL ONE HUNDRED THOUSAND)2189: ↉ (VULGAR FRACTION ZERO THIRDS)2469: ⑩ (CIRCLED NUMBER TEN)246a: ⑪ (CIRCLED NUMBER ELEVEN)246b: ⑫ (CIRCLED NUMBER TWELVE)246c: ⑬ (CIRCLED NUMBER THIRTEEN)246d: ⑭ (CIRCLED NUMBER FOURTEEN)246e: ⑮ (CIRCLED NUMBER FIFTEEN)246f: ⑯ (CIRCLED NUMBER SIXTEEN)2470: ⑰ (CIRCLED NUMBER SEVENTEEN)2471: ⑱ (CIRCLED NUMBER EIGHTEEN)2472: ⑲ (CIRCLED NUMBER NINETEEN)2473: ⑳ (CIRCLED NUMBER TWENTY)247d: ⑽ (PARENTHESIZED NUMBER TEN)247e: ⑾ (PARENTHESIZED NUMBER ELEVEN)247f: ⑿ (PARENTHESIZED NUMBER TWELVE)2480: ⒀ (PARENTHESIZED NUMBER THIRTEEN)2481: ⒁ (PARENTHESIZED NUMBER FOURTEEN)2482: ⒂ (PARENTHESIZED NUMBER FIFTEEN)2483: ⒃ (PARENTHESIZED NUMBER SIXTEEN)2484: ⒄ (PARENTHESIZED NUMBER SEVENTEEN)2485: ⒅ (PARENTHESIZED NUMBER EIGHTEEN)2486: ⒆ (PARENTHESIZED NUMBER NINETEEN)2487: ⒇ (PARENTHESIZED NUMBER TWENTY)2491: ⒑ (NUMBER TEN FULL STOP)2492: ⒒ (NUMBER ELEVEN FULL STOP)2493: ⒓ (NUMBER TWELVE FULL STOP)2494: ⒔ (NUMBER THIRTEEN FULL STOP)2495: ⒕ (NUMBER FOURTEEN FULL STOP)2496: ⒖ (NUMBER FIFTEEN FULL STOP)2497: ⒗ (NUMBER SIXTEEN FULL STOP)2498: ⒘ (NUMBER SEVENTEEN FULL STOP)2499: ⒙ (NUMBER EIGHTEEN FULL STOP)249a: ⒚ (NUMBER NINETEEN FULL STOP)249b: ⒛ (NUMBER TWENTY FULL STOP)24eb: ⓫ (NEGATIVE CIRCLED NUMBER ELEVEN)24ec: ⓬ (NEGATIVE CIRCLED NUMBER TWELVE)24ed: ⓭ (NEGATIVE CIRCLED NUMBER THIRTEEN)24ee: ⓮ (NEGATIVE CIRCLED NUMBER FOURTEEN)24ef: ⓯ (NEGATIVE CIRCLED NUMBER FIFTEEN)24f0: ⓰ (NEGATIVE CIRCLED NUMBER SIXTEEN)24f1: ⓱ (NEGATIVE CIRCLED NUMBER SEVENTEEN)24f2: ⓲ (NEGATIVE CIRCLED NUMBER EIGHTEEN)24f3: ⓳ (NEGATIVE CIRCLED NUMBER NINETEEN)24f4: ⓴ (NEGATIVE CIRCLED NUMBER TWENTY)24fe: ⓾ (DOUBLE CIRCLED NUMBER TEN)277f: ❿ (DINGBAT NEGATIVE CIRCLED NUMBER TEN)2789: ➉ (DINGBAT CIRCLED SANS-SERIF NUMBER TEN)2793: ➓ (DINGBAT NEGATIVE CIRCLED SANS-SERIF NUMBER TEN)2cfd: ⳽ (COPTIC FRACTION ONE HALF)3007: 〇 (IDEOGRAPHIC NUMBER ZERO)3021: 〡 (HANGZHOU NUMERAL ONE)3022: 〢 (HANGZHOU NUMERAL TWO)3023: 〣 (HANGZHOU NUMERAL THREE)3024: 〤 (HANGZHOU NUMERAL FOUR)3025: 〥 (HANGZHOU NUMERAL FIVE)3026: 〦 (HANGZHOU NUMERAL SIX)3027: 〧 (HANGZHOU NUMERAL SEVEN)3028: 〨 (HANGZHOU NUMERAL EIGHT)3029: 〩 (HANGZHOU NUMERAL NINE)3038: 〸 (HANGZHOU NUMERAL TEN)3039: 〹 (HANGZHOU NUMERAL TWENTY)303a: 〺 (HANGZHOU NUMERAL THIRTY)3192: ㆒ (IDEOGRAPHIC ANNOTATION ONE MARK)3193: ㆓ (IDEOGRAPHIC ANNOTATION TWO MARK)3194: ㆔ (IDEOGRAPHIC ANNOTATION THREE MARK)3195: ㆕ (IDEOGRAPHIC ANNOTATION FOUR MARK)3220: ㈠ (PARENTHESIZED IDEOGRAPH ONE)3221: ㈡ (PARENTHESIZED IDEOGRAPH TWO)3222: ㈢ (PARENTHESIZED IDEOGRAPH THREE)3223: ㈣ (PARENTHESIZED IDEOGRAPH FOUR)3224: ㈤ (PARENTHESIZED IDEOGRAPH FIVE)3225: ㈥ (PARENTHESIZED IDEOGRAPH SIX)3226: ㈦ (PARENTHESIZED IDEOGRAPH SEVEN)3227: ㈧ (PARENTHESIZED IDEOGRAPH EIGHT)3228: ㈨ (PARENTHESIZED IDEOGRAPH NINE)3229: ㈩ (PARENTHESIZED IDEOGRAPH TEN)3251: ㉑ (CIRCLED NUMBER TWENTY ONE)3252: ㉒ (CIRCLED NUMBER TWENTY TWO)3253: ㉓ (CIRCLED NUMBER TWENTY THREE)3254: ㉔ (CIRCLED NUMBER TWENTY FOUR)3255: ㉕ (CIRCLED NUMBER TWENTY FIVE)3256: ㉖ (CIRCLED NUMBER TWENTY SIX)3257: ㉗ (CIRCLED NUMBER TWENTY SEVEN)3258: ㉘ (CIRCLED NUMBER TWENTY EIGHT)3259: ㉙ (CIRCLED NUMBER TWENTY NINE)325a: ㉚ (CIRCLED NUMBER THIRTY)325b: ㉛ (CIRCLED NUMBER THIRTY ONE)325c: ㉜ (CIRCLED NUMBER THIRTY TWO)325d: ㉝ (CIRCLED NUMBER THIRTY THREE)325e: ㉞ (CIRCLED NUMBER THIRTY FOUR)325f: ㉟ (CIRCLED NUMBER THIRTY FIVE)3280: ㊀ (CIRCLED IDEOGRAPH ONE)3281: ㊁ (CIRCLED IDEOGRAPH TWO)3282: ㊂ (CIRCLED IDEOGRAPH THREE)3283: ㊃ (CIRCLED IDEOGRAPH FOUR)3284: ㊄ (CIRCLED IDEOGRAPH FIVE)3285: ㊅ (CIRCLED IDEOGRAPH SIX)3286: ㊆ (CIRCLED IDEOGRAPH SEVEN)3287: ㊇ (CIRCLED IDEOGRAPH EIGHT)3288: ㊈ (CIRCLED IDEOGRAPH NINE)3289: ㊉ (CIRCLED IDEOGRAPH TEN)32b1: ㊱ (CIRCLED NUMBER THIRTY SIX)32b2: ㊲ (CIRCLED NUMBER THIRTY SEVEN)32b3: ㊳ (CIRCLED NUMBER THIRTY EIGHT)32b4: ㊴ (CIRCLED NUMBER THIRTY NINE)32b5: ㊵ (CIRCLED NUMBER FORTY)32b6: ㊶ (CIRCLED NUMBER FORTY ONE)32b7: ㊷ (CIRCLED NUMBER FORTY TWO)32b8: ㊸ (CIRCLED NUMBER FORTY THREE)32b9: ㊹ (CIRCLED NUMBER FORTY FOUR)32ba: ㊺ (CIRCLED NUMBER FORTY FIVE)32bb: ㊻ (CIRCLED NUMBER FORTY SIX)32bc: ㊼ (CIRCLED NUMBER FORTY SEVEN)32bd: ㊽ (CIRCLED NUMBER FORTY EIGHT)32be: ㊾ (CIRCLED NUMBER FORTY NINE)32bf: ㊿ (CIRCLED NUMBER FIFTY)3405: 㐅 (CJK UNIFIED IDEOGRAPH-3405)3483: 㒃 (CJK UNIFIED IDEOGRAPH-3483)382a: 㠪 (CJK UNIFIED IDEOGRAPH-382A)3b4d: 㭍 (CJK UNIFIED IDEOGRAPH-3B4D)4e00: 一 (CJK UNIFIED IDEOGRAPH-4E00)4e03: 七 (CJK UNIFIED IDEOGRAPH-4E03)4e07: 万 (CJK UNIFIED IDEOGRAPH-4E07)4e09: 三 (CJK UNIFIED IDEOGRAPH-4E09)4e5d: 九 (CJK UNIFIED IDEOGRAPH-4E5D)4e8c: 二 (CJK UNIFIED IDEOGRAPH-4E8C)4e94: 五 (CJK UNIFIED IDEOGRAPH-4E94)4e96: 亖 (CJK UNIFIED IDEOGRAPH-4E96)4ebf: 亿 (CJK UNIFIED IDEOGRAPH-4EBF)4ec0: 什 (CJK UNIFIED IDEOGRAPH-4EC0)4edf: 仟 (CJK UNIFIED IDEOGRAPH-4EDF)4ee8: 仨 (CJK UNIFIED IDEOGRAPH-4EE8)4f0d: 伍 (CJK UNIFIED IDEOGRAPH-4F0D)4f70: 佰 (CJK UNIFIED IDEOGRAPH-4F70)5104: 億 (CJK UNIFIED IDEOGRAPH-5104)5146: 兆 (CJK UNIFIED IDEOGRAPH-5146)5169: 兩 (CJK UNIFIED IDEOGRAPH-5169)516b: 八 (CJK UNIFIED IDEOGRAPH-516B)516d: 六 (CJK UNIFIED IDEOGRAPH-516D)5341: 十 (CJK UNIFIED IDEOGRAPH-5341)5343: 千 (CJK UNIFIED IDEOGRAPH-5343)5344: 卄 (CJK UNIFIED IDEOGRAPH-5344)5345: 卅 (CJK UNIFIED IDEOGRAPH-5345)534c: 卌 (CJK UNIFIED IDEOGRAPH-534C)53c1: 叁 (CJK UNIFIED IDEOGRAPH-53C1)53c2: 参 (CJK UNIFIED IDEOGRAPH-53C2)53c3: 參 (CJK UNIFIED IDEOGRAPH-53C3)53c4: 叄 (CJK UNIFIED IDEOGRAPH-53C4)56db: 四 (CJK UNIFIED IDEOGRAPH-56DB)58f1: 壱 (CJK UNIFIED IDEOGRAPH-58F1)58f9: 壹 (CJK UNIFIED IDEOGRAPH-58F9)5e7a: 幺 (CJK UNIFIED IDEOGRAPH-5E7A)5efe: 廾 (CJK UNIFIED IDEOGRAPH-5EFE)5eff: 廿 (CJK UNIFIED IDEOGRAPH-5EFF)5f0c: 弌 (CJK UNIFIED IDEOGRAPH-5F0C)5f0d: 弍 (CJK UNIFIED IDEOGRAPH-5F0D)5f0e: 弎 (CJK UNIFIED IDEOGRAPH-5F0E)5f10: 弐 (CJK UNIFIED IDEOGRAPH-5F10)62fe: 拾 (CJK UNIFIED IDEOGRAPH-62FE)634c: 捌 (CJK UNIFIED IDEOGRAPH-634C)67d2: 柒 (CJK UNIFIED IDEOGRAPH-67D2)6f06: 漆 (CJK UNIFIED IDEOGRAPH-6F06)7396: 玖 (CJK UNIFIED IDEOGRAPH-7396)767e: 百 (CJK UNIFIED IDEOGRAPH-767E)8086: 肆 (CJK UNIFIED IDEOGRAPH-8086)842c: 萬 (CJK UNIFIED IDEOGRAPH-842C)8cae: 貮 (CJK UNIFIED IDEOGRAPH-8CAE)8cb3: 貳 (CJK UNIFIED IDEOGRAPH-8CB3)8d30: 贰 (CJK UNIFIED IDEOGRAPH-8D30)9621: 阡 (CJK UNIFIED IDEOGRAPH-9621)9646: 陆 (CJK UNIFIED IDEOGRAPH-9646)964c: 陌 (CJK UNIFIED IDEOGRAPH-964C)9678: 陸 (CJK UNIFIED IDEOGRAPH-9678)96f6: 零 (CJK UNIFIED IDEOGRAPH-96F6)a6e6: ꛦ (BAMUM LETTER MO)a6e7: ꛧ (BAMUM LETTER MBAA)a6e8: ꛨ (BAMUM LETTER TET)a6e9: ꛩ (BAMUM LETTER KPA)a6ea: ꛪ (BAMUM LETTER TEN)a6eb: ꛫ (BAMUM LETTER NTUU)a6ec: ꛬ (BAMUM LETTER SAMBA)a6ed: ꛭ (BAMUM LETTER FAAMAE)a6ee: ꛮ (BAMUM LETTER KOVUU)a6ef: ꛯ (BAMUM LETTER KOGHOM)a830: ꠰ (NORTH INDIC FRACTION ONE QUARTER)a831: ꠱ (NORTH INDIC FRACTION ONE HALF)a832: ꠲ (NORTH INDIC FRACTION THREE QUARTERS)a833: ꠳ (NORTH INDIC FRACTION ONE SIXTEENTH)a834: ꠴ (NORTH INDIC FRACTION ONE EIGHTH)a835: ꠵ (NORTH INDIC FRACTION THREE SIXTEENTHS)f96b: 參 (CJK COMPATIBILITY IDEOGRAPH-F96B)f973: 拾 (CJK COMPATIBILITY IDEOGRAPH-F973)f978: 兩 (CJK COMPATIBILITY IDEOGRAPH-F978)f9b2: 零 (CJK COMPATIBILITY IDEOGRAPH-F9B2)f9d1: 六 (CJK COMPATIBILITY IDEOGRAPH-F9D1)f9d3: 陸 (CJK COMPATIBILITY IDEOGRAPH-F9D3)f9fd: 什 (CJK COMPATIBILITY IDEOGRAPH-F9FD)但是，从Unipre 6.3.0开始，不再认为Numeric_Type = Digit和Numeric_Type =
Numeric之间的区别，并且Numeric_Type =
Digit不再用于新字符。引用Unipre标准附件＃44：
从Unipre 6.3.0开始，将不给新编码的数字字符Numeric_Type = Digit，也不会将现有的具有Numeric_Type =
Numeric的字符更改为Numeric_Type = Digit。认为这两种类型之间的区别没有用。
因此，
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