repeating key

例句：

1. 1. The teacher repeated the lesson several times to ensure everyone understood.
   老师多次重复讲解，确保每个人都理解了。
2. 2.The song has a repeating melody that is hard to forget.
   这首歌有一个重复的旋律，很难忘记。
3. 3. The patient repeated the medication instructions until she felt more confident.
   病人反复阅读药物说明，直到她感到更自信。