Yaar
（用作友好称呼）朋友, 伙计
🗣️ 情景例句
How should I feel?
我该作何感想？
Cheerfulness and goodwill make labour light.
欢快与好意，劳动不觉累。
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）