关于four－year－old

关于four－year－old four-year-old和four year old有什么不同 only four year old意思 my father is---------- (four) year old a four-year-old boy可以说成a four-year old boy 请问:是a four years old boy?还是a four year old boy?正确 four-year-old和middle-aged 杠表示是什么? My nine-year-old daughter,Maria,is in Year Four.怎么翻译 英语翻译还有,“他四岁”是说he is four years old还是he is four year old? one－year-old前面用an还是a They were surprised that a four-year-old boy should work out 英语翻译Faith is a four year old dogshe is a member of the black