Pentafluorination
五氟化反应
🗣️ 情景例句
Well ...
嗯……
If you agree to carry the calf, they'll make you carry the cow.
得寸进尺。
Half past four. Don't forget to tell Jim. I hope he can come too.
4：30。别忘记告诉吉姆。我希望他也能来。