在过去能源还很便宜的时候,房屋建造者不用太担心密封的裂口（你确定呢是UN?）
2.因为有如此（多）的漏洞,平均每个房间里的空气都会被门外的新鲜空气替换大概一小时一次.
3实际上（所以,因此）,由一家人产生的污染物很少构建成危险的等级
英语翻译1.Back in the days when energy was cheap,home builders d
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