The treatment should be repeated every two to three hours.

　　這種治療方法應(yīng)該每隔兩到三小時重復(fù)一次。

　　I think we should go back to first principles.

　　我認為我們應(yīng)該回到基本原則上。

　　You should not go out in the heat of the day.

　　你不應(yīng)該在天最熱的時候外出。

　　I think you should go back to your original plan.

　　我認為你應(yīng)該回頭執(zhí)行你原來的計劃。

　　The new trade agreement should facilitate more rapid economic growth.

　　新貿(mào)易協(xié)定應(yīng)當(dāng)會加快經(jīng)濟發(fā)展。