“periodic field focusing”的概念、定义、翻译、参考文献-科学参考

单词	periodic field focusing
释义	periodic field focusing [¦pir·ē¦äd·ik `fēld ´fō·kǝ·siŋ] ^ELECTRONICS Focusing of an electron beam where the electrons follow a trochoidal path and the focusing field interacts with them at selected points.
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