Particles from outside this region can fall in, cross the event horizon, and will never be able to leave.

来自外面这个区域的粒子能落进去，越过活动视界，而将永远不能够离开。

youdao

Particles from outside this region can fall in, cross the event horizon, and will never be able to leave.

来自外面这个区域的粒子能落进去，越过活动视界，而将永远不能够离开。

youdao