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。