That's why radioactive isotopes spontaneously decay and eject subatomic particles and radiation in the process.

这就是放射性同位素自发衰变并在此过程中喷射出亚原子粒子和辐射的原因。

A black hole can engulf matter in its immediate vicinity and eject powerful particles beyond the galaxy that harbor the black hole at the center.

黑洞可以吞没其附近的物质，并将强大的粒子喷射到中心黑洞所在的星系之外。