Diffusion (vacuum)pump
[化] 扩散泵; 扩散真空泵
🧩 词语组成解析
🗣️ 情景例句
The patient showed a marked improvement.
病人病情显著好转。
Have you drunk any coffee?
你喝过咖啡吗？
There is a boat in the river.
小河里有一条船。