《论衡·卷十三·超奇篇》
山丘以泥土石头为主体，山中要是有铜铁，就是山上罕见的东西。
故夫丘山以土石为体，其有铜铁，山之奇也。
Hills and hills are mainly composed of earth and stone. If there is copper or iron in the mountain, it is a rare thing on the mountain.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 故夫丘山以土石为体，其有铜铁，山之奇也。 [/INST] Hills and hills are mainly composed of earth and stone. If there is copper or iron in the mountain, it is a rare thing on the mountain.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 故夫丘山以土石为体，其有铜铁，山之奇也。
user
Hills and hills are mainly composed of earth and stone. If there is copper or iron in the mountain, it is a rare thing on the mountain.
assistant