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No cooling fan, silent operation.
没有冷却风扇，静默工作。
youdao
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Their big advantages are high efficiency, silent operation and low emissions.
效能 、无噪音、低排放是这一技术最为突出的几大优点。
youdao
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Their big advantages are high efficiency, silent operation and low emissions.
效能 、无噪音、低排放是这一技术最为突出的几大优点。
youdao