非法书商们售出了价值7,500万美元的盗版书。Bootleggers sold 75 million dollars-worth of copies.所有的书商都出售这种书.This kind of books is sold by all booksellers.这本书定于9月10号发行，但是一些书商已抢先一步，决定提前销售。It wasn't due to be released until September 10, b...
Bad temper is his worst infirmity.坏脾气是他最大的弱点.Old age and infirmity had begun to catch up with him.他开始显出年老体衰的样子了.those incapable of supporting themselves by reason of age and infirmity那些因为年迈体衰而不能养活自己的人We all fear disabili...
This article briefly discusses the conveyer with Delta VFD - S series inverter.本文对基于台达VFD-S系列变频器调速的输送机作简要讨论.It comprises of a push - pull forward converter and a dual buck inverter.主电路采用推挽正激变换器和双降压式逆变器.This paper focuses...