Mesitylic acid
[化] 2,4,4-三甲基-5-氧代脯氨酸
🧩 词语组成解析
🗣️ 情景例句
We'll come upstairs and get you in a little while.
我们待会儿就上楼来带你下去。
When the tree is fallen, every one runs to it with his axe.
大树一倒下，人人持斧来。
What do the machines do? asked Jim.
“这些机器做什么用？”吉姆问。