Fluorocarbon
[建] 碳氟化合物
🗣️ 情景例句
I don't like to travel during the holiday season.
我不喜欢在放假的季节去旅游。
As you travel westward,does the land get higher?
当你向西旅行，陆地变得更高？
but where had it come from?
但它是从哪儿来的呢？