it expands and rises
它膨胀上升
以上为机器翻译结果，长、整句建议使用 人工翻译 。
When it rises towards the warmer surface the wax melts and expands, which compresses a tank of air.
当它上升至暖水层时蜡会融化并膨胀，从而挤压容器内的空气。
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As the air rises, it expands and cools, and water vapour condenses, releasing even more heat.
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