Prechlorination
预加氯
🗣️ 情景例句
Uh, are you going to be busy this evening?
今晚忙吗？
Long tarrying takes all the thanks away.
事情耽搁太久就没有人会感谢了。
When a shock came, it shook the rigid table upon which these stood.
一旦有地震，就会震动竖立在坚硬的桌子上的木棒。