Optical constants
[电] 光学常数
🧩 词语组成解析
n. 常量, 常数；物理常数（constant的复数）
🗣️ 情景例句
I fell in love with him at first sight.
我对他一见钟情。
My brother wants to learn how to drive a car.
我的兄弟要去学驾驶。
Yes, it was. But it's much colder today.
是的，昨天冷。但是今天更冷。