He could just make out three people through the mist.

　　透過(guò)薄霧他勉強(qiáng)能看出有三個(gè)人。

　　The operation could prolong his life by two or three years.

　　這次手術(shù)可使他多活兩三年。

　　The treatment should be repeated every two to three hours.

　　這種治療方法應(yīng)該每隔兩到三小時(shí)重復(fù)一次。

　　Do it now please ─ not in three hours' time.

　　請(qǐng)現(xiàn)在就干，而不是三個(gè)小時(shí)之后。

　　There's room for three people in back.

　　后排有可容三人的空位。