Knudsen number
[化] 克努森数
🧩 词语组成解析
n. 努森（M·H·C, 1871-1949, 丹麦物理学家）
🗣️ 情景例句
Never pump gas with the engine running.
发动机在运转时，别加油。
I asked him to paint it for me, but he wouldn't
我请他帮我油漆，但是他不肯。
Today Native Americans express their anger over this business deal.
今天，美国的土著人对这桩买卖仍然愤愤不平。