Muscle mass naturally diminishes with age.

肌肉组织会随着年龄而自然减少。

And their satisfaction diminishes every day.

对它们的满意度也每天递减。

With increasing age, brain function diminishes.

随着年龄的增加，大脑功能降低。

Light also oxidizes fat and diminishes the flavor of milk.

而且光照可以氧化脂肪和降低牛奶的风味。

In general, when freedom diminishes, motivation contracts as well.

总的来说，当自由度减小时，动机也会缩小。