Pentafluorization
五氟化反应
🗣️ 情景例句
Just sketching.
只是画些草图。
I can't recall how long it's been.
我不能记起多长时间了。
I'm certain he'll go to see the film, because he's bought a ticket.
我肯定他会去看电影的，冈为他把票都买好了。