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
Richard, did you go to the Davis Aerobics class today? Richard
你去上Davis有氧运动健身课了吗？
Think much, speak little, and write less.
勤思考，寡发言，少落笔。
By then, however, in many places the grass had already taken root.
然而到那时，很多地方的草已经生了根。