once-forbidden adj.一次禁戒的once-firing 一次燒成once upon a time 從前once upon a potty once too often 又一次;次數(shù)太多once through tubular boiler [交通運(yùn)輸工程]直流式鍋爐once through 單程的once over once more 再一次once in a while once in a way 偶爾once in a lifetime love once in a lifetime 一生一次once in a blue moon 千載難逢;極為罕見once for all 徹底地;一勞永逸地;只此一次once every month 每月一次once every four years 每四年一次once caldas once and for all change [經(jīng)濟(jì)學(xué)]一次性變動(dòng)once and for all