Pentafluorination
五氟化反应
🗣️ 情景例句
Advice doesn't normally come cheap, but this piece is for free...
通常来说，忠告都是价值不菲的，但这个是免费赠送的。。。
He that will take the bird must not scare it.
欲捉鸟莫惊鸟。
No, I can't hear anything.
没有，我什么也没听见。