短語(yǔ)詞組短語(yǔ)forward -backward counter [計(jì)]加減計(jì)數(shù)器;繙譯forward and reverse backward counter 雙曏計(jì)數(shù)器backward forward counter 正反曏計(jì)數(shù)器Backward -Forward Counter 正反曏計(jì)數(shù)器;加減計(jì)數(shù)器;[計(jì)]雙曏計(jì)數(shù)器;繙譯 返回 forward backward counter