It is not advisable just to sit there brooding about the unpleasant bygones.

老是坐在那里不乐想着过去那些不愉快事情并不好。

He was then brooding what to do.

他当时正沉思要做什么。

The hen is brooding her eggs.

母鸡正在孵小鸡。

What It Is: Post-dumpage, you're going to find yourself with a lot of time—time that's often spent getting misty over the past and brooding over what went wrong.

被抛弃后，你会突然发现你有了大量时间--你曾经用那些时间“穿”过往事间迷惘，想搞明白到底你错在哪里。