名词
中文翻译：直接循环
同义词：
['circulation', 'flow', 'movement']
例句：
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1.The heart's direct circulation is essential for its functioning.
心脏的直接循环对它的运作至关重要。
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2. The river has a direct circulation that helps to regulate the water level.
这条河流有直接的循环，有助于调节水位。
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3. Direct circulation of nutrients is essential for plant growth.
营养物质的直接循环对于植物生长至关重要。