Crotonylene
[化] 巴豆炔; 2-丁炔
🗣️ 情景例句
What did you learn at school today?
你今天在学校学了什么？
He sees things. He has gone crazy.
他有幻觉。他疯了。
What did you do at the meeting?
你们在会上做什么呢？