C-4-fraction
[化] 碳四馏分
🧩 词语组成解析
🗣️ 情景例句
I can take the bus to work ...
我可以坐公共汽车上班……
Yesterday was Sunday.
昨天是星期日。
But I didn't see much during the flight because there was too much cloud.
但我在飞行途中并没有看到什么东西，因为云层很厚。