11.The morning sun never lasts a day.
好景不常；朝阳不能光照全日。
12.Christmas comes but once a year.
圣诞一年只一度。
13.Pleasant hours fly past.
快乐时光去如飞。
14.To save time is to lengthen life.
节省时间就是延长生命。
15.Everything has its time and that time must be watched.
万物皆有时，时来不可失。
16.When an opportunity is neglected, it never comes back to you.
机不可失，时不再来；机会一过，永不再来。
17.Make hay while the sun shines.
晒草要趁太阳好。
18.Strike while the iron is hot.
趁热打铁。
19.Work today,for you know not how much you may be hindered tomrrow.
今朝有事今朝做，明朝可能阻碍多。
20.Knowledge is power.
知识就是力量。
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