They have cleared up the cause of the physical change.

他们已经搞清楚这个物理变化的成因。

《新英汉大辞典》

For example, melted (溶解的) cheese has gone through a physical change.

例如，奶酪的溶解便是一个物理变化。

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Aylmer said. "I have already given you chemicals powerful enough to change your entire physical system.

VOA: special.2009.09.26

Type II Diabetes usually has its onset in adulthood-- that's beginning to change-- and is usually created by lifestyle factors: poor diet, physical inactivity, and obesity.

型糖尿病多见于成人,情况现在开始改变,这种病通常由不良生活方式引起,不良的饮食,锻炼的缺乏以及肥胖

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Another possible reason for more injuries is a change in the traditional idea of physical education.

VOA: special.2009.08.06

However, it is unclear whether this difference is a key to understanding how autism develops - or simply a physical change brought about by years of actually being autistic.

BBC: Why autism can't find a face

Our physical change needed to reinforce our cultural change.

CNN: RBS CEO Hester: We can't afford to give up on banks

The unit found that the brain could be naturally vulnerable or even pre-disposed to the illness and could be more susceptible to an eating disorder following a physical change in the brain due to an event that happened in child hood.

BBC: Eating disorders 'on the increase'