《山海经·山经·北山经》
绳水从这座山发源，然后向东流入黄河，水中有很多蒲夷鱼。
绳水出焉，而东流注于河，其中多蒲夷之鱼。
The Sheng River has its source in this mountain and it flows eastwards into the Yellow River. There are a lot of Pui Yi fish in the river.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 绳水出焉，而东流注于河，其中多蒲夷之鱼。 [/INST] The Sheng River has its source in this mountain and it flows eastwards into the Yellow River. There are a lot of Pui Yi fish in the river.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 绳水出焉，而东流注于河，其中多蒲夷之鱼。
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The Sheng River has its source in this mountain and it flows eastwards into the Yellow River. There are a lot of Pui Yi fish in the river.
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