在试验的基础上，总结归纳了聚氨酯软泡沫塑料隔热性能的普遍性规律。

On these influence of affect factors of thermal conductivity, the thermal conductivity of the soft polyurethane foam has been measured and the relation curve of thermal conductivity have been given.

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针对林业地理信息系统开发时，系统设计的普遍性规律，具体探讨系统设计的原则及方法。

Aimed at the universal laws of system design while exploiting forestry GIS, this article did a concrete research to the principles and methods of system design.

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虽然在一些研究中出现不明显的和无规律的呼吸道反应增多的迹象，但这些明显的影响并不具有普遍性。

While there has been a weak and inconsistent signal of increases in reactive airway conditions in some studies, these apparent effects have not been consistently observed.

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