以下为句子列表：
英文: A typical dual duct system would have 2 zone supply air paths – one for the hot air and one for the cold air – and 1 zone return air path.
中文: 而对于典型的双管系统，则由两条区域送风路径（一条用于热空气、一条用于冷空气）和一条区域回风路径组成。
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英文: A wintry blast is bringing cold air down and dumping up to a foot of snow on some parts of the region.
中文: 一股寒冷的强风给这里的部分地区带来了冷空气和一英尺的强降雪。
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英文: Both types of samples were exposed to cold air flow.
中文: 同一类型的两个样品被暴露了在冷空气流程。
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英文: Cold air is frequent in March and April in northern China and it brings gales and sand storms to the areas.
中文: 三四月份的中国北部冷空气活动频繁。它给该地区带来了大风和沙尘暴。
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英文: Develops a new type of swirling cold air diffuser and tests its performance in aspects of aerodynamics, cold air supply and noise.
中文: 摘要研制了一种旋流式低温送风口，并进行了空气动力学、低温送风及噪声测试。
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