这样的系统能持续从室外引入新鲜空气更新室内空气，并且用排出的废气的热量加热引入的空气。
Such a system constantly refreshes your house with fresh air from outdoors but cleverly heats the incoming air with the warm, stale air that's being vented out.
这样的系统能持续从室外引入新鲜空气更新室内空气，并且用排出的废气的热量加热引入的空气。
Such a system constantly refreshes your house with fresh air from outdoors but cleverly heats the incoming air with the warm, stale air that's being vented out.
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