Under second order approximation both troughs and ridges of unstable isolated waves are formed in different locations, and for stable isolated waves only troughs are formed.
二级近似时其解为孤立波形式——不稳定时，在地形不同位置可形成东移或西移的孤立波槽或孤立波脊； 而在稳定时只形成孤立波槽。
Di Achille said the shoreline evidence was found along a broad delta and included a series of alternating ridges and troughs thought to be surviving remnants of beach deposits.
盖迪阿希尔说，是沿着一个大的三角洲和发现的海岸线证据，包括海滩积累的残留下来的一系列的交替脊和浪谷。
Troughs thick with summer-green sedges and other wet-loving plants ruffle the dry brown ridges of an Alaska bog.
冰蚀槽长满了夏绿色的莎草和其他喜爱潮湿的植物，蜿蜒在阿拉斯加一处酸沼的褐色干燥山脊上。
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