Knudsen diffusion
[化] 克努森扩散
🧩 词语组成解析
n. 努森（M·H·C, 1871-1949, 丹麦物理学家）
🗣️ 情景例句
International travel involves a lot of waiting around in airports.
经常在机场等候是环球旅行的一部分。
It's December.
现在是十二月。
There is so much variety that you never have to make do with second best.
物品种繁多，从来不必用二等品来凑合。