Cycloolefines
[化] 环烯烃
🗣️ 情景例句
What are you trying to say?
你想说什么？
Whe angry, count ten before you speak; if very angry, a hundred.
怒时数十再说话，大怒数百方开言。
Have you got a hat, sir?
先生，您有帽子吗？