The electron source may emit electrons either via field emission or thermionic emission.
该电子源可经由场发射或热离子发射来发射电子。
The matrix of dots on a CRT screen (or TV set) that emit light when bombarded by an electron beam.
阴极射线管(crt)或电视(tv)屏幕上的点阵列，当电子束击中时会发光。
As a convenient and cheap cathode, velvet can emit intensive electron beam and is widely used in high power electron devices.
天鹅绒阴极能够产生高亮度强流电子束，并且成本低、使用方便，在强流高功率单脉冲电子束装置中得到了广泛的应用。
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