单词	electron gun
释义	electron gun noun : an electron-emitting cathode and its surrounding assembly (such as electromagnets in a cathode-ray tube) for directing, controlling, and focusing a beam of electrons Example Sentences Recent Examples on the Web The researchers expect that the whole kit, including the electron gun, can be encapsulated on a chip. Chris Lee, Ars Technica, 22 July 2019 Varying the output of the electron gun, however, can create a lopsided force deliberately, permitting the craft to be steered. The Economist, 21 Sep. 2017 Word History First Known Use 1924, in the meaning defined above
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