Pentafluorination
五氟化反应
🗣️ 情景例句
And have you had an engineer come in to do an inspection?
你们可有一个工程师来做过检查吗？
It's none of my business,but I think you ought to work harder.
它是不关我的事，但是我认为你应该努力工作。
Yes, I do.
是的，我喜欢。