trough of the sea

• 波谷

trough of the sea的用法和样例：

例句

1. Where a trough and crest coincide we get the total amplitude zero.
   在波峰与波谷重合之处，总振幅实际上为零。
2. The sailor dislikes to have his ship get into the trough of the sea.
   海员很不愿意让船只陷入海浪的波谷之中。