When designing the house, the toilet must be equipped with ventilation equipment.
装修时，卫生间一定要留有风道。
Before work should open ventilation equipment, open indoor door window maintain indoor ventilation.
工作前应开启通风设备，打开室内的门窗保持室内通风良好。
Before work should open ventilation equipment, open indoor door window maintain indoor ventilation.
工作前应开启通风设备，打开室内的门窗保持室内通风良好。
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