Ureogenesis
脲生成, 尿素生成
🗣️ 情景例句
What year are you?
你是哪一级的？
You (or One) cannot make a silk purse out of a sow's ear.
粗瓷碗雕不出细花来。
It will be by special invitation only.
我们只邀请特别的客户