What is the content of Du Fu's poem about cherishing historic sites? Find out the words that can point out the main idea in the original text.

The content of the poem is to express his feelings by writing about Zhaojun Village and remembering Wang Zhaojun. The poet sympathized with Wang Zhaojun's experience and expressed deep sympathy. At the same time, it showed Zhao Jun's yearning and resentment for his old country, praised Zhao Jun's spirit of returning home despite his death, and pinned his life experience and patriotism on it.

The sentence that points out the central idea is: the song of Tatar on her jade guitar tells her eternal sadness.