Boundary Element Method(BEM) is applied to simulate electron optics system of multi-beam klystron with PRPM focusing in this paper.是什么意思_Boundary Element Method(BEM) is applied to simulate electron optics system of multi-beam klystron with PRPM focusing in this paper.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句