Childs said the lung condition of asthma; obesity, or being extremely overweight; and dental problems are the leading physical causes.

蔡尔兹说，哮喘等肺部疾病、肥胖或极度超重以及牙齿问题是主要的生理原因。

Could this have a purely physical cause?

这可能有纯粹的物理原因吗？

They might have a purely physical cause.

他们可能有纯粹的物理原因。

Many of Freud's female patients in Viennese high society suffered from 'hysterical paralysis' — an inability to walk that had no physical cause.

弗洛伊德在维也纳上流社会的许多女性病人都患有“歇斯底里性瘫痪”——一种没有身体原因的无法走路的症状。

These changes in him had both physical and spiritual causes; and one of these changes he was now undergoing.

他身上的这些变化既有身体上的原因，也有精神上的原因。而他现在正在经历的这些变化之一。

When it is said that light is waves, what is really meant is that waves are the physical cause of our sensations of light.

当说光是波时， 真正的意思是波是我们对光的感觉的物理原因。

The further theory, that there are physical causes for a regular cycle of good and bad harvests, is, of course, a different matter with which we are not concerned here.

更进一步的理论，即有规律的好收成和坏收成循环的物理原因，当然是另一回事，我们在这里不关心。