Tetranitrocompound
四硝基化合物
🗣️ 情景例句
He studied harder to improve his English.
他更加努力提高英语水平。
If you would make an enemy,lend a man money and ask it of him again.
你若想与人结怨，只须先借钱给他，再向他催讨。
Let's do that.
那就这么说定吧？