polarity inversionpolarity reversalpolarity reversedreversal of polarityreversal of poles反转: counter revolution; back-dra ...周期极性反转: periodic polarity reversal极性反转放大器: polarity inverting amplifier极性反转晶体管: polarity inversion transistors性反转: sex reversal; sex transformation下载手机词典可随时随地查词查翻译