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1·She cut the cake into fifths.

她把蛋糕切成五块。《牛津词典》

2·About three fifths of them do.

大约五分之三的人这样做。

3·Among all these books, three fifths of them are for children to read.

所有这些书中，有五分之三是给孩子们读的。

4·About two fifths of the student in Kaili go to school by bus.

在凯里，大约有五分之二的学生坐公交车上学。

5·Nowadays, a number of people like HUAWEI phones better, and about four-fifths of them are adults.

现在，很多人更喜欢华为手机，这些人中大约五分之四是成年人。

6·Two fifths of the students in our class are going to the summer camp in Beijing next week.

我们班五分之二的学生下周要去北京参加夏令营。

7·There are fifty students in this class, three fifths of them are boys, so the number of the boys is 30.

这个班有50个学生，其中五分之三是男孩，所以男孩的人数是30。

8·According to a survey, four out of five women do housework at home, but only two fifths of men would do it.

根据一项调查，五分之四的女性会做家务，但只有五分之二的男性会做家务。

9·About three fifths of American families don't watch TV whey they have dinner.

大约有五分之三的美国家庭吃饭时不看电视。

10·The ivory Buddha carved by Shen Weizhong is the world's smallest piece of sculpture, its size being just four-fifths of a grain of rice.

沈为众雕刻的象牙佛像是世界上最小的雕刻，它只有一粒米的五分之四大。

(1)fifth avenue（美国纽约的）第五大道

(1)the fifth century5世纪

(1)fifth amendment（美国宪法修正案）第五条

(1)fifth columnn. 第五纵队

(1)fifth republic法兰西第五共和国（成立于1958年）