Pentafluorination
五氟化反应
🗣️ 情景例句
What shades of lipstick do you sell?
你们卖的口红有什么颜色的？
The healthful man can give counsel to the sick.
健康的人可以对生病的人提出忠告。
As it is only six feet across, it is barely noticeable.
仅6英尺宽，很难被发现。