B-b fraction
[化] 丁烷-丁烯馏分
🧩 词语组成解析
🗣️ 情景例句
We have to maintain communication to understand each other.
必须保持交流以求相互理解。
The thunder claps really scare the children.
打雷的声音真的会吓坏小孩子的。
It is better to ask for help at the beginning rather than to wait until a busy period when everyone is rushed off their feet.
最好在开始工作时就请人帮忙，而不是等到大学都忙得不可开交的时候。