Monochlorination
一氯化作用
🗣️ 情景例句
There's a conversation we have to finish.
我们有一段话还没有谈完呢。
As long as you like it.
你喜欢就好！
But here we come up against the most difficult of all obstacles to contact with people on other planets ----the astronomical distances which separate us.
然而，在和外星人联系中我们遇到的最大困难是分隔我们的天文距离。