four-year-old为什么year不用复数形式
four-year-old和four year old有什么不同
only four year old意思
last year my English class was difficult.此句的class为什么不用复数形式
为什么 a four-year-old boy中的year可以不加复数,而分数two-thirds中连字符后的third
my father is---------- (four) year old
关于four-year-old
Deenie is about a thirteen-year-old girl.中的year为什么不用加s?
the following year 为什么year不变复数?
a four-year-old boy可以说成a four-year old boy
I have 0 year of work experience这句话中 year该是复数形式吗?为什么
They were children.Four and five-year-olds,为什么old加s
5 year green card中,为何year不是复数形式?