If you ruminate on something, you think about it very carefully.
例句
He ruminated on the terrible wastage that typified American life...他認真地考慮了美國生活中典型的嚴重浪費問題。Obsessional personalities commonly ruminate excessively about death.有強迫癥的人通常過多地思考死亡的問題。
VERB
（動物）反芻
When animals ruminate, they bring food back from their stomach into their mouth and chew it again.
例句
He wanted to have a look at the two oxen, both ruminating without raising their eyes.他想看看那兩頭牛，它們都在反芻，眼睛都不抬一下。