1/3 : one-third
1/12：one-twelfth
7/12: seven-twelfths
以下是金山词典里的标准答案，自己仔细研究一下，可以帮你举一反三哦
1/2 : one-half;a half
1/3 : one-third
3/4 : three-fourths
1/5 : one-fifth
2/5 : two-fifths
7/8 : seven-eighths
1/10 : one-tenth;a tenth
1/100 : one-hundredth;one per cent
1/1000 : one-thousandth
1/10000 : one ten-thousandth
21/2 : two and one half;two and a half
42/3 : four and two-thirds
