to allow natural processes to happen, without trying to stop or change them (used especially in the context of illness)让自然顺其自然：允许自然过程发生，而又不试图阻止或改变它们（特别是在生病的情况下使用）
The midwife must judge when to let nature take its course and when to intervene.助产士必须判断何时顺其自然，何时介入。
When the dog responded so badly to the treatment, we decided to let nature take its course.这条狗经过治疗后也没什么起色，于是我们就决定放弃治疗，听其自然。