B-b fraction
[化] 丁烷-丁烯馏分
🧩 词语组成解析
🗣️ 情景例句
He knows everything about the production schedule,
他知道生产进度的一切情况，
Did you send it to him yourself?
你自己亲自送给他吗？
The plane wasn't too badly damaged, but over the years, the crash was forgotten and the wreck remained undisturbed.
飞机损坏的程度并不严重，但是，多年来这起飞机失事已被遗忘，飞机残骸也没受到破坏。