短語詞組用作動詞 (v.)～+介詞decrease by 3 times 減少三倍decrease by 5 tons 減少五噸decrease by ten percent 減少百分之十decrease in number 數目減少decrease to 減少到用作名詞 (n.)形容詞+～gradual decrease 逐漸下降sharp decrease 急劇下降slight decrease 略微減少steady decrease 穩(wěn)定下降介詞+～on the decrease 在減少decrease in 在…方面的減少decrease in production 生產下降decrease to three hundred 減少到300短語 返回 decreases