室内外空气的交换速度，这取决于房屋的构造、居住者的通风习惯和窗户的密封程度。
The rate of exchange between indoor and outdoor air, which depends on the construction of the house, the ventilation habits of the inhabitants, and the sealing of Windows.
如果人类社会的变革或生存方式的转换速度不能适应于生态环境的急剧恶化，饥荒和瘟疫必将不可避免地发生。
When the speed of human innovation and its transfer were not fast enough to keep pace with rapid ecological change, famine and disease became difficult to avoid.
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