Optical constant
[计] 光学常数
🧩 词语组成解析
🗣️ 情景例句
What's that?
什么事？
What makes life dreary is the want of motive.
没有目的，人生就黯淡无光。
Indeed, it may well be that those whose work is their pleasure are those who most need the means of banishing it at intervals from their minds.
说实在的，把工作当作享受的那些人可能最需要每隔一段时间把工作从头脑中撇开。