介词短语
中文翻译：在潮汐的最低点
同义词：
['at the lowest point', 'at the ebb', 'at the trough', 'at the nadir', 'at the lowest point of the tide例句：1. The ship is on the ebb', "so it's not moving very fast.（船在退潮，所以移动得不快。）"]
例句：
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1. The ship is on the ebb, so it's not moving very fast.
船在退潮，所以移动得不快。
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2. The fishermen are on the ebb, waiting for the tide to come in.
渔民们正在退潮，等待潮水上涨。
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3.The economy is on the ebb, and many businesses are struggling to survive.
经济正处于衰退期，许多企业都在挣扎求生。