four layer transistor四: four层: I storey; tier; stratum晶体管: transistor; crystal valve三层晶体管: three layer transistor微层晶体管: microlayer transistor下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:四层晶体管，即可在微信中查询翻译
