16.The day is short but the work is much.

　　工作多，光阴迫。

　　17.Never deter till tomorrow that which you can do today.

　　今日事须今日毕，切勿拖延到明天。

　　18.Have you somewhat to do tomorrow,do it today.

　　明天如有事，今天就去做。 19.To him that does everything in its proper time,one day is worth three.

　　事事及时做，一日胜三日。

　　20.To save time is to lengthen life.

　　节省时间就是延长生命。