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He ruminated over the problem .

他反复思考这个问题。

He ruminated on what had happened the day before .

他在沉思前一天发生的事情。

Both of them ruminated on the distant past .

他们都想起了久逝的往事。

He ruminated on the evening in future retrospect and recalled every gesture , every word .

他在夜晚要深思未来的每一个姿势，每一句话。

The scout ruminated , like a man digesting his newly acquired knowledge , and once more stole a curious glance at the two horses .

侦察员沉思着，仿佛在消化新学到的知识，一面又好奇地朝那两匹马悄悄看了一眼。