Dinitration
二硝化作用
🗣️ 情景例句
Why, I didn't know that your grandfather was born in Germany.
你看 我竟然不知道您的爷爷出生在德国。
Where the knot is loose the string slips.
结子一松掉，绳子就滑脱。
What's it used for?
有什么用途？