We learn from history that we do not learn from history.

【答】有时候，英语句子像是绕口令，其实这是一种修辞格，蕴含寓意。旨在让读者记忆深刻，留下无穷趣味。

理解句子的意思，还是从结构上入手。这是一个主从复合句：主句+宾语从句。为理解方便，我把结构微调一下：

From history we learn that we do not learn from history.

【翻译】从历史中我们得到启示：我们并没有以史为鉴。

learn的意思在这里不是“学习”，而是“认识到，获悉，得到启示”。

1. learn from history 意为“从历史中得到启示”

2. do not learn from history意为“没有从历史中得到启示”（没有以史为鉴）

再举几个绕口令的句子：

1. Bell sells seashells on the seashore. The seashells Bell sells are seashore seashells.

2. Please light a night light on a light night like tonight.

3. Shore never saw a saw saw a stone.

4. How many good cookies could a good cook cook if a good cook could cook as many good cookies as a good cook could cook?