Definition
An expression encouraging immediate action rather than procrastination.
前人栽树，后人乘凉
You've been talking about learning a new skill; there's no time like the present!
你一直在说要学习新技能；把握当下，立即行动！
They've always wanted to travel; since they have time now, why not leave immediately? There's no time like the present!
他们一直想去旅行；既然现在有时间，为什么不马上出发？把握当下！
If you want to change jobs, start looking now; there's no time like the present.
如果你想换工作，现在就开始找吧；把握当下。