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1.The fish had a long, thin tail that was used for swimming in water.
这条鱼有一条长长的尾巴，用于在水中游泳。
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2.The scientist studied the behavior of fish and their tails to understand how they move through the water.
这位科学家研究了鱼类的行为和尾巴，以了解它们如何在水中移动。
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3.The tail is an important part of the fish's body, helping it swim and balance.
尾巴是鱼类身体的重要组成部分，帮助它游泳和保持平衡。