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1. The cavity heater is designed to heat up the room quickly.
这个空腔加热器设计用来快速加热房间。
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2. The cavity insulator is used to keep the interior of a vehicle cool during the summer.
这个空腔绝热体用于在夏天保持车辆内部凉爽。
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3. The cavity cooler is installed in the ceiling of the warehouse to reduce the temperature inside.
这个空腔冷却器安装在仓库的天花板上，以降低内部温度。