外因的英文：
exopathic cause
external agencies
external cause

Disorders of old age are generally not exogenous.
老年疾病通长都不是起於外因的。

externalize sb.'s failure
把某人的失败归咎于外因

The accident was caused by slippery roads.
意外因路滑而引起。

external ordering
外次序

There must be externally moderated tests.
一定要有外聘人员负责审核评分的考试。

Language externalizes thought.
语言使思想具体化。