turn over in one's mind;Ideas revolved in one's mind.;look before and after;reflect and muse ;

As he pondered on the train home something in his own self seemed to have died.
他坐火车回家,在车上前思后想时,他自己身上有些东西仿佛也已死去.
来源:词典精选例句The other merchant considered carefully and realized there were advantages in going second.
商人乙前思后想,觉得后行的人比较有利.
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