Hempel paradox

例句：

1. 1. The Hempel paradox is a concept in logic that challenges the idea of causality.
   亨佩尔悖论是逻辑中的一个概念，挑战了因果关系的理念。
2. 2. In his book, he presented several examples of the Hempel paradox.
   在他的书中，他提出了几个亨佩尔悖论的例子。
3. 3. The Hempel paradox has been a topic of discussion among philosophers for decades.
   亨佩尔悖论一直是哲学家们讨论了几十年的话题。