ejection,emission,injection有什么区别?各举几个固定搭配?

ejection
KK:[]
DJ:[]
n.
1.排斥
2.喷出
3.射出物
emission
KK:[]
DJ:[]
n.
1.放射;散发
2.射出物
3.发行
injection
KK:[]
DJ:[]
n.
1.注射[C][U][(+into)]
It's time for another injection.
又该打针了.
2.注射剂,注射液[C]
The doctor prescribed three injections.
医生开了三支注射液的处方.
3.(人造卫星等的)射入轨道[U]
4.引入;投入[C][U][(+into)]
Many scholars were annoyed by his injection of politics into academic discussions.
他把政治引进学术讨论中,使很多学者感到恼火.
5.(毛细血管等的)充血[U]

ejection是喷射，向外喷出，很快。像磁铁，互相eject（排斥)。
emission更趋向于散发，慢点儿。像香气的散发。
injection是射入，像打针时就用injection。少量的。
要说固定搭配...他们都是名词，没啥固定搭配的...

ejection 是弹出 喷出
emission 排放，放射状流出
injection 是注入，打针