英语年代和岁数的两个问题1.inthe1960s是否等于inthe1960's2.一个五岁的男孩：（1）a5-year-oldboy（2）a5years'oldboy(3)a5yearsoldboy(4)a5-yearoldboy哪个是对的?还有其他的表达方式么?

Question

英语年代和岁数的两个问题
1.in the 1960s是否等于in the 1960's
2.一个五岁的男孩：
（1）a 5-year-old boy
（2）a 5 years' old boy
(3)a 5 years old boy
(4)a 5-year old boy
哪个是对的?
还有其他的表达方式么?

Answer 1

1.表示二十世纪六十年代,第二种是错的
2．A.a 5-year-old boy
= a boy aged 5
= a boy 5 years old
= the boy is 5 years old
= a boy of 5 = the boy's age is 5
= he is 5 = he is aged 5