Metacetonic acid
[化] 丙酸
🧩 词语组成解析
🗣️ 情景例句
I'm thrilled for you, Grandpa.
我真为你兴奋， 爷爷。
Don't forget to put stamps on the letter before you mail it.
不要忘记在寄信以前把邮票贴在信封上。
Did you know he was having an affair?
你知道他有外遇了吗？