Dinitration
二硝化作用
🗣️ 情景例句
It looks wonderful.
看起来很好看。
Do you have a letter of introduction?
你有介绍信吗？
We could have a walk around. Let's go out at about six o'clock, shall we?
我们可以四处走走。咱们大约6点出发，行吗？