如果温度读数低于设置点，那么关闭外部通风。
If the temperature reading is below the set point, turn off external ventilation.
如果温度读数低于设置点，那么打开外部通风。
If the temperature reading is below the set point, turn on external ventilation.
如果温度读数高于设置点，那么打开外部通风。
If the temperature reading is above the set point, turn on external ventilation.
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