ruminate

他喜欢在散步时沉思生活的意义。

He likes to ___ruminate on the meaning of life while taking a walk.

山羊静静地站在山坡上，反刍着食物。

The goat stood quietly on the hillside, ___ruminating its food.

她反复考虑了这份工作邀请好几天，在稳定和热爱之间难以抉择。

She ___ruminated over the job offer for days, unable to decide between stability and her passion.