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
Where there's a will, there's a way.
有志者事竟成。
He who has done ill once will do it again.
干了一次坏事的人会再干第二次。
Recently the New York Animal Medical Center made a study of 132 cats over a period of five months.
最近，纽约动物医疗中心对132只猫进行了为期5个月的综合研究。