为什么12-year-old=12 years old

为什么12-year-old=12 years old 12 -year-old 和12 years old的区别 _____ you 12 years old last year? yes, I _____ 13 years old this year. 改错：The 12-year-old boy is old enough to look after him.The 12-year-old boy is old enough to look after him. four-year-old为什么year不用复数形式 I am 12 year old改疑问句和回答 My this year 12 years old怎么读 一个十二岁的女孩翻译这样可以吗?A 12-year old girl或者A 12-year-old girl 为什么有时候可以省略介词?有这样一句话：A 12-year-old black boy,I attended a school there that was otherwise all white.之前A 12-year-old black boy是不是省略了介词as。但是如果改成：As a 12-year-old black boy,I atten is a （）girl.答案是13-year-old为什么eight-year-old不对 an eleven year old 和 an eleven-year-old用哪个?为什么 为什么year old是放在一起的,i am ten old this year Mr Wang is an man.A.28-year-old B.80-year-old 为什么 13-year-old=13 years 如果是,那为什么哪? a thirteen-year-old boy=什么? how old is the old woman i think she isA.70-year-old B.70 yearsC.70 year old D 70 years old 说下为什么 usaco 1.1.3.Friday(黑色星期五)我是pascal看看：var i,n,day,month,year:longint;a:array[1..7]of longint;beginreadln(n);month:=1;year:=1900;for i:=1 to 7 doa[i]:=0;a[6]:=1;day:=6;for i:=2 to 12*n dobegininc(month);if month =13 then begin inc(ye 请问12-year old/ 12-years-old/ 12-year-old/ 12 years old这四项有什么不同?还有就是two-weeks holiday two weeks'holidays two-week holiday two-weeks'holiday 有什么不同?这几个概念有点混淆