为这个段落添加一个主题句。 
这是一个有序的段落，但没有主题句。
Human beings have been fascinated by the idea of a utopian society for centuries. From Plato's "Republic" to Thomas More's "Utopia," the concept of a perfect world has been explored in literature, philosophy, and even politics. Philosophers have debated the possibility of achieving such an ideal society, while authors have written about what such a society might look like.
The pursuit of a utopian society has captivated human imagination for centuries, as evidenced by its recurring exploration in literature, philosophy, and politics.