Lost time never found again . 岁月既往一去不回
Make hay while the sun shines . 勿失良机
Time flies . 光阴似箭
Time past can’t be called back again . 时间不能倒流
Time and tide wait for no man . 岁月不待人
Opportunity seldom knocks twice . 机不可失，失不再来
Wasting time is robbing oneself . 浪费时间就是掠夺自己
Time is money . 时间就是金钱
What may be done at any time will be done at no time . 明 日待明日，明日不再来
Tomorrow never comes . 明日复明日，明日何其多
