Perfect optical system
[化] 理想光学系统
🧩 词语组成解析
🗣️ 情景例句
Hello.
哈喽。
It was not until the accident happened that I became aware of my own foolishness.
直到事故发生我才意识到我自己的愚蠢。
Students often create amusing situations which are funny to everyone except the victims.
大学生们常常做的是制造一种可笑的局面，使大家笑上一场，当然受害者是笑不出来的。