Hollow cathode is a key assemble of ion engine.So it is import ant to study its failure mode for improve the reliability of ion thruster.是什么意思_Hollow cathode is a key assemble of ion engine.So it is import ant to study its failure mode for improve the reliability of ion thruster.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句