Rayleigh number
[化] 瑞利数
🧩 词语组成解析
n. 瑞利（姓氏）；雷利（极光和夜天光的发光强度的单位）
🗣️ 情景例句
They have an opening.
他们有一个空房间。
Fall sick and you will see who is your friend and who is not.
困难见友情。
I've decided to bring seven.
我决定带七位。