B-b fraction
[化] 丁烷-丁烯馏分
🧩 词语组成解析
🗣️ 情景例句
I'm an exchange student.
我是一名交换学生。
I didn't notice you were wearing your new hat.
我没注意你戴了新帽子。
There was danger that the wave would rebound off the other side of the bank and send the dish plunging into the water again.
但是当波浪从河对岸折回来时，就有再次把盘子拖进水里的危险。