B-b fraction
[化] 丁烷-丁烯馏分
🧩 词语组成解析
🗣️ 情景例句
I think the building just needs a good cleaning.
我想那座建筑只需要好好地打扫一下。
What are you looking at? Never seen this before.
看什么看？没看过啊！
I'm doing some washing and John is cooking dinner.
我正在洗衣服，约翰在做晚饭。