精练

例句：

1. 1. The teacher asked us to study thetext more carefully and to refine our ideas.
   老师让我们仔细研读文本并提炼我们的想法。
2. 2. The engineer refined the design ofthe new machine to improve its efficiency.
   工程师对新机器的设计进行了优化以提高其效率。
3. 3. The writer refined his prose tomake it more concise and effective.
   作家对他的散文进行了精炼，使其更加简洁有效。