Leonard pottered round the greenhouse, tying up canes for the tomatoes.伦纳德在温室里悠然自得地给西红柿绑上撑杆。It's no use tying it; you have to glue it.捆它没用, 你必须用胶把它粘上.He spent two hours tying all the parcels with string.他花了两个小时用绳捆扎所...
Since 1908, chlorine has been added to drinking water.自1908年以来氯就被添加进饮用水当中。Chlorine is used to disinfect water.氯用来给水消毒。Chlorine is added to kill bacteria.加氯是为了杀死细菌。...