troughs的例句（troughs在句子中的用法）

• 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。
• 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 boat rolled heavily in the troughs between the waves. 船在波涛起伏的海浪中剧烈摇摆。