Etheride
酰卤化物
🗣️ 情景例句
What are you doing up this late?
这么晚了你还没睡在做什么？
Does it make any difference to you whether we have our lesson at two o'clock or at three o'clock?
我们在两点上课还是在三点上课，你觉得有关系吗？
Yes, here it is.
是的，在这儿。