名词
中文翻译：直接空气循环
同义词：
['Direct air circulation', 'Direct air flow', 'Direct air circulation system']
例句：
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1.In the direct-air cycle, the exhaust gases are directly expelled from the engine into the atmosphere.
在直接空气循环中，废气直接从发动机排出到大气中。
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2. The design of the direct-air cycle heat exchanger is optimized for efficient heat transfer.
直接空气循环换热器的设计优化了高效的热传递。
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3.The direct-air cycle technology has been widely used in industrial processes to improve energy efficiency and reduce emissions.
直接空气循环技术已被广泛应用于工业过程中，以提高能源效率并减少排放。