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1.The outside circulation of the city's public transportation system is crucial for its efficiency.
城市公共交通系统的外部循环对其效率至关重要。
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2.The researchers found that the outside circulation of the blood could be improved by adjusting the diet.
研究人员发现，通过调整饮食可以改善血液的外部循环。
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3. The outside circulation of the oil in the tank was slow, which caused the engine to overheat.
油箱中的油外部循环缓慢，导致发动机过热。