Oxynitration
羟硝化作用(同时加上羟基和硝基)
🗣️ 情景例句
You should use 'officer' to address a policeman.
你应该用 'officer' 来称呼警察。
You must be hungry. Shall we get something to eat?
你一定饿了，我们吃点东西好吗？
Be careful!
小心点！别摔了！