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.
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.
这有一种极端不利的环境条件，如空气污染。
There is an extremely adverse environmental condition, such as air pollution.
这有一种极端不利的环境条件，如空气污染。
There is an extremely adverse environmental condition, such as air pollution.
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