琢磨

例句：

1. 1. He spent hours puzzling over the problem.
   他花了好几个小时来解决这个问题。
2. 2. I need to think carefully before making a decision.
   在做出决定之前，我需要仔细思考。
3. 3. The teacher asked us to muse over the text before class.
   老师要求我们在课前仔细思考文本。