Quinuclidinyl
奎宁环基
🗣️ 情景例句
If you aren't busy today, how about lunch?
如果你今天有空的话，吃一顿午饭如何？
If I had had time,I would have called you.
如果我有时间，我就打电话给你了。
We had roast beef and potatoes.
我们吃的是烤牛肉和土豆。