名词
中文翻译：死水
同义词：
['stagnant water', 'still water']
例句：
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1. The river is so stagnant that it's hard to see the bottom.
这条河太脏了，几乎看不到底部。
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2. The lake has become a stagnant pool since the rain stopped.
自从雨停后，这个湖就变成了一个静止的池塘。
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3. The old man sat by the stagnant pond for hours, watching the fishes swim around.
老人坐在那个静止的池塘旁边坐了好几个小时，看着鱼在周围游来游去。