随着70年代更好的绝缘房屋的出现，房屋每小时空气交换更少，于是我们称为“紧致住房”或“疾病住房”综合症的疾病可能出现。

With the advent in the 1970s of much better insulation of buildings, coupled with far fewer air exchanges per hour, so-called "tight building" or "sick building" syndrome can occur.

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我明白，不论时空如何交换，只要阅读这些伟大的作品，我们便可在精神领域成为知己好友。

I do know how we become friends of the human spirit in all its manifestations, regardless of time and place. It is by reading the great books.

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采用箱式模型、二维ADI流体方程和对流扩散模型计算浔江湾海水交换时间，分析浔江湾的水动力特点和湾内海水交换时空分布的特点。

With the box model, 2D ADI tidal current equation and convectiondiffusion model, the exchange time of Xunjiang bay water is computated.

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