ejection造句
Radioactivity is the
ejection of particles or radiation from the nucleus.
放射性是原子从核中射出粒子或辐射的现象.
Most of the crater is formed by
ejection.
大多数的弹坑是由于把泥土抛出而形成的.
A rocket is propelled by the
ejection of a portion of its mass to the rear.
火箭是靠向后喷射其部分质量而推进的.