该句使用if条件句表达因果关系，清楚展现努力与未来结果的联系。
Time is the best doctor.
He who wastes time will be wasted by time. —— Shakespeare
If you do not work hard in your youth, you will regret it in your old age.
Time reveals all things.
The clouds disperse easily, and the summer heat is hard to linger. —— Wang Bo
Time is like water in a sponge; as long as you are willing to squeeze, there will always be some. —— Lu Xun
Tomorrow follows tomorrow, and there are so many tomorrows; if I wait for tomorrow, everything will be lost.
If you do not work hard in your youth, you will regret it in your old age. —— Han Yuefu Changge Xing
The lamps burn at midnight and the roosters crow at dawn; this is the time for a man to study. It is better to study while hair is black than to regret it when it turns white. —— Yan Zhenqing
The sunset is boundless and the river flows endlessly; I must be even busier today. —— Chen Shidao
Do not wait until tomorrow for what can be done today; do not wait for others to do what you can do yourself. —— Goethe
A lame man who sets out early cannot catch up. —— Japan
The ambitious cherish the short days, while the sorrowful know the long nights. —— Fu Xuan
Flowing water never returns, and time never turns back.
Do not waste time; do something useful every moment and abandon all unnecessary actions.
时间是最好的医生。
抛弃时间的人，时间也会抛弃他。——莎士比亚
少壮不努力，老大徒伤悲。
时间能揭露万事。
天波易谢，寸暑难留。——王勃
时间就像海绵里的水一样，只要你愿意挤，总还是有的。——鲁迅
明日复明日，明日何其多，我生待明日，万事成蹉跎。
少壮不努力，老大徒伤悲。——《汉乐府长歌行》
三更灯火五更鸡，正是男儿读书时。黑发不如勤学早，白发方悔读书迟。——颜真卿
落日无边江不尽，此身此日更须忙。——陈师道
今天所做之事勿候明天，自己所做之事勿候他人。——歌德
起早外出的跛子追不上。——日本
志士惜日短，愁人知夜长。——傅玄
逝水无回，光阴难驻。
不浪费时间，每时每刻都做些有用的事，戒掉一切不必要的行为。
"If youth does not strive, old age will bring only regret."
"Youth is a beautiful dream that can only be built through hard work."
"Study hard and work diligently to make your youth more brilliant."
"Youth must face trials of constant struggle to forge a vibrant life."
"We should use our hard work and striving to embellish our youth with brilliance."