名词
中文翻译：自然循环同义词
同义词：
['natural flow', 'natural circulation', 'natural convection']
例句：
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1. The natural circulation of the blood in our bodies is essential for maintaining health.
我们体内的血液自然循环对于保持健康至关重要。
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2. In a natural circulation system, water moves from high-pressure areas to low-pressure areas.
在自然循环系统中，水从高压区域流向低压区域。
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3. The natural circulation of gases through the Earth's atmosphere is crucial for photosynthesis.
气体通过地球大气的自然循环对光合作用至关重要。