Piperidone
哌啶酮
🗣️ 情景例句
That took place right after the First World War, didn't it?
它就发生在第一次世界大战之后，是吗？
Money is a good servant but a bad master.
要做金钱的主人，莫作金钱的奴隶。
Is it very cold in winter?
冬季的天气很冷吗？