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在冬天,人们为了防寒,总是习惯于将窗户紧紧关闭。这样做是不好的。在冬天气温低,也应常开窗换气。这样的益处是:首先,它能送进新鲜空气,减少室
In winter, people are accustomed to closing windows tightly in order to prevent cold. This is not good. Low temperatures in winter, but also often open the window ventilation. The benefits are: First, it can feed fresh air and reduce the room