C-4-fraction
[化] 碳四馏分
🧩 词语组成解析
🗣️ 情景例句
How did he get to be a department head so fast?
他怎么这么快就成为一个部门的主管？
The plane has crashed.
飞机失事了。
It's very kind of you to help me.
你帮助我真是太好了。