这些污水必须经过多重洗涤和过滤,才能重新进入循环系统。Zhèxiē wūshuǐ bìxū jīngguò duōchóng xǐdí hé guòlǜ, cái néng chóngxīn jìnrù xúnhuán xìtǒng.This wastewater must undergo multiple rounds of washing and filtration before it can re-enter the circulation system.
她小心地洗涤那件丝绸衬衫,生怕弄坏。Tā xiǎoxīn de xǐdí nà jiàn sīchóu chènshān, shēngpà nòng huài.She carefully washed that silk shirt, afraid of ruining it.
护士告诉他每天都要认真洗涤伤口。Hùshi gàosu tā měitiān dōu yào rènzhēn xǐdí shāngkǒu.The nurse told him that the wound must be carefully washed every day.