to learn by heart

例句：

1. 1.She was able to understandthe problem without asking for help.
   她能够不求助就理解这个问题。
2. 2.The teacher explained the concept in a waythat everyone could understand.
   老师用一种每个人都能理解的方式解释了这个概念。
3. 3. He understood the situationperfectly, even though he had never beenthere before.
   他完全理解了那个情况，尽管他以前从未去过那里。