He likes to brood over his past mistakes.

他喜欢沉思过去的错误。

It's not healthy to brood over things you can't change.

沉思那些你无法改变的事情是不健康的。

Don't brood over lost opportunities.

别为失去的机会懊丧不已。

I have two luxurious to brood over in my walks, your loveliness and the hour of my death.

散步时，两件事占据我的思绪，你动人的容颜和我死期。

Hearing that the 8th Route Army thought women should have equality with men, she began to brood over her actions and think it wrong to partake of her mother-in-law's revels .

她听说八路军提倡男女平等，认真地反省了一下自己的荒唐行为，认识到不该参与她婆婆干的那些见不得人的勾当。