ruminate [ˈru:mɪneɪt]

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vt. 反刍；沉思；反复思考 vi. 沉思，反刍

to think carefully and for a long period about something

It is worth while to ruminate over his remarks. 他的话值得玩味。
The cow began to ruminate after eating up grass. 牛吃完草后开始反刍。