废水处理不彻底,河床里仍残留着重金属污染物。Fèishuǐ chǔlǐ bù chèdǐ, héchuáng lǐ réng cánliú zhe zhòngjīnshǔ wūrǎnwù.The wastewater treatment was incomplete, and heavy-metal pollutants still remain in the riverbed.
洗完碗后,盘子上还残留着一点油。Xǐ wán wǎn hòu, pánzi shang hái cánliú zhe yìdiǎn yóu.After washing the dishes, a little grease still remained on the plate.
水果用清水泡一泡,可以去掉表面残留的农药。Shuǐguǒ yòng qīngshuǐ pào yì pào, kěyǐ qùdiào biǎomiàn cánliú de nóngyào.Soaking fruit in clean water can remove pesticide residue from the surface.