🗣️ 情景例句
Macro adjustment is needed in a market economy.
市场经济需要宠观调控。
You need to transfer at central station.
你必须在中央车站换车。
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）