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Warm air cools wind - PowerPoint PPT Presentation

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Warm-up. In Chinese herbal tea shops , bowls of herbal tea are usually covered by glass plates. Why do the shop owners need to do this?. Warm-up. Some freezers at supermarkets do not have doors. This is just opposite to what herbal tea shops do. What could be the reason?. Introduction.

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Warm air cools wind - PowerPoint PPT Presentation

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