Undershrinking
收缩不足
🗣️ 情景例句
I'm Richard. What's your name?
我是Richard！你叫什么？
We have agreed on all terms in the contract. Shall we sign it next week?
我们对合同各项条款全无异议，下周签合同如何？
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）