However, The CTC as a byproduct in the production of chloromethane is about 3 ~5 %.然而在甲烷氯化物的生产过程中, 不可避免地要有3-5%左右的副产物四氯化碳生成.There's also dioxin, a byproduct of paper manufacture and waste incineration.还有二恶英, 纸生产和废物燃烧...
酒精的害处the harmful effects of alcohol法律禁止商店向未成年者出售含酒精的饮料.The law forbids shops to sell alcohol to minors.在学校里只准许他们出售不含酒精的饮料.They are only allowed to sell soft drinks at school....