飞机得在达到一定的速度以后，才能有足够的提升力从地面起飞。

An aeroplane has to reach a certain speed before there is enough lift to get it off the ground.

《柯林斯英汉双解大词典》

你拥有一定的速度。

You have a certain velocity.

youdao

具有一定的速度。

v It has a certain velocity v.

youdao

So, you picked up some speed, then you're coasting along at a steady speed.

所以当你加到一定速度,然后你便匀速上升的时候

耶鲁公开课 - 基础物理课程节选

In other words, replacing the shortest distance between two points that we experience in a practical message, "literariness," as the formalists call it, or "poetic language," as they also sometimes call it and as the New Critics certainly call it, slows us down.

也就是说，实用语言以最短的距离,联系两点，而文学性，如形式主义者所称，或诗意的语言，他们有时也会这么叫,新批评派成员一定会这么称呼，使我们的理解速度慢了下来。

耶鲁公开课 - 文学理论导论课程节选

It's going at some speed.

有一定的速度

耶鲁公开课 - 基础物理课程节选