" a five-year plan. 一个五年计划"的YEAR不用加S,而 a seven-years child里的YEAR要加要呢?

a five-year plan. 一个五年计划的YEAR不用加S,而 a seven-years child里的YEAR要加要呢? We should work hard to finish the tenth----.A.five-years plan B.five-years-plan C.five-year-plan D.five-years-planplan是名词啊？理由是什么？ which is wrong?a for-hour trip / two five--year plan / a four --act play / a million--pound note. five years plans是五年计划吗~还是five-years plan或是five-year plans / five-year plan那我看到有人写five years plans对吗~ five times a year 对five 提问 英语中“-”（横杠）的详细用法和例子就是像a five-year plan 里面的那个横杠具体用法和例子 a five-year plan.一个五年计划这句干嘛那个year不用加s呢?请那位朋友帮下忙,本人是英语菜鸟.但是a seven-years child里又有s, 2.Cathy is a ---girl.A.five years B.five-years-old C.five-year-old D.five-year old His little brother is ( ) a) five years old b)five-years-old c)five-year-old d) five-year-old a five-year-old boy还是a five-year old boy 英语作文：A good plan for the new school year 翻译：A year's plan starts with spring. A year’s plan storts with spring是什么意思 关于名词的英语语法类似 late-night a ten-mile walk 十里路 two-hundred trees 两百棵树 a five-year plan. 一个五年计划这样的例子```词之间都有一横``为什么要用一横“-”这要怎么 英语翻译3.Bioomedical research will enable many individuals infected with HIV to live longer,more comfortable lives.4.The central government has published a five-year action plan meant to encourage all parts of society to join in AIDS prevention He sister is ( )than he A.younger five years B.five years younger C.five year youngerD.five younger years He is a ____ boy .He is a ____ boy .A.five-years-old B.five years old C.five-year-old D.five year old The little boy is only _____ A.five year old B.five-year-oldC.five-years-old D.five old填选项里的