C-4-fraction
[化] 碳四馏分
🧩 词语组成解析
🗣️ 情景例句
We haven't heard from him for weeks but we're still hoping for a letter.
我们已经有几个星期没有他的消息，但仍然盼望着他的来信。
A constant guest is never welcome.
久住非佳宾，常来不欢迎。
I don't think you'll have any difficulty in pushing sales.
我认为你推销时不会有任何困难。