当环境条件变化时，这些材料就会找到一种新的理想形态。
When the conditions of the environment change, the material finds a new ideal form.
近代真空技术作为一种实用的基础技术，由于它提供了稀薄的气体氛围和清洁的环境条件，获得了越来越广泛的应用。
The modern vacuum technology as a practical basic skill has been used more and more widely, because it can produce rare gas and clean environment.
一种极端不利的环境条件，如空气污染。
An extremely adverse environmental condition, such as air pollution.
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