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 got a Dear John letter from her.
我收到她的绝交信了。
I don't know what time it is.
我不知道现在几点钟。
Like his father, he was driving a car called Bluebird.
同他父亲一样，他也驾驶着一辆名叫“蓝鸟”的汽车。