英语中的数词

英语中的数词分为基数词和序数词两大类。

基数词（Cardinal Numbers）

基数词用于表示数量，包括以下几种：

1. 个位数（1-9）：

1: one

2: two

3: three

4: four

5: five

6: six

7: seven

8: eight

9: nine

2. 十位数（10-19）：

10: ten

11: eleven

12: twelve

13: thirteen

14: fourteen

15: fifteen

16: sixteen

17: seventeen

18: eighteen

19: nineteen

3. 二十位及以上：

20: twenty

30: thirty

40: forty

50: fifty

60: sixty

70: seventy

80: eighty

90: ninety

4. 百位及以上：

100: one hundred

200: two hundred

300: three hundred

400: four hundred

500: five hundred

600: six hundred

700: seven hundred

800: eight hundred

900: nine hundred

5. 千位及以上：

1,000: one thousand

2,000: two thousand

3,000: three thousand

10,000: ten thousand

100,000: one hundred thousand

1,000,000: one million

10,000,000: ten million

100,000,000: one hundred million

1,000,000,000: one billion

序数词（Ordinal Numbers）

序数词用于表示顺序，包括以下几种：

1. 个位数（1-9）：

1: first

2: second

3: third

4: fourth

5: fifth

6: sixth

7: seventh

8: eighth

9: ninth

2. 十位数（10-19）：

10: tenth

11: eleventh

12: twelfth

13: thirteenth

14: fourteenth

15: fifteenth

16: sixteenth

17: seventeenth

18: eighteenth

19: nineteenth

3. 二十位及以上：

20: twentieth

30: thirtieth

40: fortieth

50: fiftieth

60: sixtieth

70: seventieth

80: eightieth

90: ninetieth

4. 百位及以上：

100: hundredth

200: two hundredth

300: three hundredth

400: four hundredth

500: five hundredth

600: six hundredth

700: seven hundredth

800: eight hundredth

900: nine hundredth

5. 千位及以上：

1,000: thousandth

2,000: two thousandth

3,000: three thousandth

10,000: ten thousandth

100,000: hundred thousandth

1,000,000: millionth

10,000,000: ten millionth

100,000,000: hundred millionth

1,000,000,000: billionth

请注意，序数词通常在句中用作定语，例如 "the first car"（第一辆车）。