mull over
  琢磨,反復考慮
  mull over, v. t. To think about; to consider; to ruminate about; as, mull it over and decide in the morning. [Colloq. U.S.]
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  mull over
       v : reflect deeply on a subject; "I mulled over the events of
           the afternoon"; "philosophers have speculated on the
           question of God for thousands of years"; "The scientist
           must stop to observe and start to excogitate" [syn: chew
           over, think over, meditate, ponder, excogitate,
           contemplate, muse, reflect, mull, ruminate, speculate]