都是正確的.two-hour作為一個(gè)類似于形容詞的存在,有了“-”就不要加s了.two hours‘ 是直接修飾的,因?yàn)閔ours是復(fù)數(shù),所以“一撇”要加在s后面附上兩個(gè)例句：The town is two hours' drive from here.It's a two-hour-...two-hour-drive一定要在hour和drive之間加—嗎t(yī)wo-hour drive也對(duì)嗎hour和drive之間是不需要“-”的，因?yàn)閠wo-hour是作為定語修飾drive的，drive是一個(gè)獨(dú)立的名詞~后面一個(gè)是對(duì)的，前者“two-hour-drive”是錯(cuò)誤的。那例句中It's a two-hour-drive distance from here.是怎么回事有一道選擇題two-hourtwo hours'兩個(gè)選項(xiàng)都有，選哪個(gè)你要看前面有沒有冠詞a，如果是two-hour的話，前面必須有冠詞，因?yàn)檫@是定語修飾名詞，名詞需要冠詞。而two hours‘不需要冠詞，你可以再看一下前面的例句，這兩個(gè)雖然意思一樣，但是用法是不相同的。例句：The town is two hours' drive from here.It's a two-hour-drive distance from here.如果two-hour-drive全部連起來就是表示’兩個(gè)小時(shí)車程“的意思。我前面理解錯(cuò)誤了，two-hour-drive是正確的哦~意思就是說two-hour-drivetwo-hour drive都對(duì)，但two-hour-drive 為形容詞可在形容其他，而two-hour drive就已經(jīng)是名詞了是吧是不是只有one— year—old boy 沒有one years old' boy是的，這里one-year-old整個(gè)作為一個(gè)形容詞的成分，如果要分開來說，只能說是：This boy is one year old.