不管你打算如何消磨时间，有件事是可以肯定的，即当你抵达目的地时，你感到精神焕发，毫无倦意。

However you decide to spend your time, one thing is certain: you will arrive at your destination fresh and uncrumpled.

youdao

有件事情是可以肯定的，天空中有许多飞行物体是我们无法鉴别的。

One thing is for certain, there are objects flying in the sky that we can't identify.

youdao