He could just make out three people through the mist.

　　透過薄霧他勉強能看出有三個人。

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

　　這次手術可使他多活兩三年。

　　The treatment should be repeated every two to three hours.

　　這種治療方法應該每隔兩到三小時重復一次。

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

　　請現在就干，而不是三個小時之后。

　　There's room for three people in back.

　　后排有可容三人的空位。