Alternately, electron emission may be by thermionic means.
可选地，电子发射可以通过热离子装置。
Impregnate with thorium oxide to increase thermionic emission.
注入镀氧化物使增加热电子发射。
The liberation of electrons from a hot wire is called thermionic emission.
电子从热灯丝逸出，叫做热电子发射。
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