名词
中文翻译：自然流动
同义词：
['natural stream', 'natural current', 'natural flow rate']
例句：
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1.The river has a natural flow of water that is essential for the ecosystem.
这条河流有自然的水流，对生态系统至关重要。
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2.The company's natural flow of cash was insufficient to cover its expenses.
该公司的自然现金流不足以覆盖其开支。
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3. The natural flow of the river is so strong that it can carry away large rocks.
河水的自然流动非常强劲，足以带走大石头。