troughs造句
The boat rolled heavily in the
troughs between the waves.
船在波涛起伏的海浪中剧烈摇摆。
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。
Spacings between anticlinal crests and synclinal
troughs in the be equal in some series of folds.
岩层中的背斜峰和向斜谷之间的距离趋于相等.
The business cycle is a series of peaks and
troughs.
商业周期是一系列的高峰期和低谷期。