Dinitration
二硝化作用
🗣️ 情景例句
Ring? Ring?
戒指？ 戒指？
He said he knew a lot of people there.
他说他在那里认识很多人。
If he had not broken his tooth, he would not be in hospital now.
如果他没有把牙齿弄坏，现在就不在医院了。