The boat rolled heavily in the troughs between the waves.

小船在海浪间的波谷中剧烈地摇晃着。

There have been peaks and troughs in the long-term trend of unemployment.

长期以来失业率一直时起时伏。

Some of the bars and troughs are exposed by low tide.

一些砂洲和沟槽在低潮位时，露出于水面。

In the night use electricity troughs to charge, also can reduce costs.

在夜间利用用电低谷期进行充电，也可以减少费用。

A wave, such as a water wave, consists of a series of crests and troughs.

一个波，比如水波，由一系列的波峰和波谷组成。