Escape velocity is simply the speed of an object that's shot out of a cannon the minimum initial speed so that the object could later escape Earth's gravity on its own.

逃逸速度就是一个物体的速度，比如说，从加农炮中射出的最小初始速度，这样这个物体以后就可以自己脱离地球的引力。

youdao

Simply stated, a gas molecule can "evaporate" from a planet if it reaches a speed known as the escape velocity.

简单地说，如果气体分子达到逃逸速度，它就能从一颗行星上“蒸发”。

youdao

The gravitational field is so strong that the escape velocity near it exceeds the speed of light.

重力场是如此的强大以致于靠近它的逃逸速度超过光速。

youdao