Reflection coeffecient
[电] 反射系数
🧩 词语组成解析
🗣️ 情景例句
A dog!
一只狗！
No one is a fool always, every one sometimes.
无人总是当傻瓜，人人有时当傻瓜。
While two detectives were keeping guard at the door, two others opened the parcel.
这时两个侦探把住门口，另外两个侦探打开了包裹。