Eqination
[医] 马痘接种
🗣️ 情景例句
What's that, Mr. Carlson?
什么事， Carlson先生？
I finished my work at 6 p.m.
下午6点我下班了。
a trough (the lowest point), a height (the vertical distance from the trough to the crest),
波谷（最低点）、浪高（从波谷到浪峰的垂直距离）