Oxynitration
羟硝化作用(同时加上羟基和硝基)
🗣️ 情景例句
Be our guest.
请随意。
This week he took his first vacation from work in five years.
五年来，他本周破例第一次休假。
'Well, I'd prefer to stay here,' I said.
“可我更愿意呆在这儿，”我说，