Metacetonic acid
[化] 丙酸
🧩 词语组成解析
🗣️ 情景例句
Why shouldn't you run for what, Mom?
为什么， 不该竞选什么， 妈妈？
Why was only he exempted from work?
为什么只有他不必工作呢？
Ken gave up smoking two years ago. He'd been smoking for thirty years.
两年前肯戒了烟，之前他抽了三十年烟。