The attic is a prime source for heat and cold air exchange.
阁楼是冷热空气交换的源头。
The green environmental protection without pollution, cold light source design, no heat radiation.
绿色环保无污染，冷光源设计，无热辐射。
The green environmental protection without pollution, cold light source design, no heat radiation.
绿色环保无污染，冷光源设计，无热辐射。
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