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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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。

youdao