Preacquaint
vt. 预先通知, 预告
🗣️ 情景例句
Yes, it is.
是的。
How far is it from here to the bus stop?
到公共汽车站有多远？
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）