B-b fraction
[化] 丁烷-丁烯馏分
🧩 词语组成解析
🗣️ 情景例句
How do you do?
您好！
Honesty is the best policy.
诚实是上策。
The development of films with sound became a problem for Chaplin.
有声电影的研制对卓别林来说就成了问题。