《水经注·卷二十一》
汝水又往东南流经定陵县老城北面，汉成帝元延三年前，将定陵封给侍中卫尉淳于长，立为侯国，王莽时改名为定城。
汝水又东南，径定陵县故城北。汉成帝元延三年，封侍中、卫尉淳于长为侯国，王莽更之曰定城矣。
The Ru River flows southeast again, passing by the north side of the old city of Dingling County. Before the third year of Emperor Cheng of the Han Dynasty, Dingling was granted to the chamberlain and imperial guardian Chunyu Chang and established as a marquisate. During the reign of Wang Mang, it was renamed Dingcheng.
<s>[INST] 将以下现代汉语文本改写为文言文: 汝水又往东南流经定陵县老城北面，汉成帝元延三年前，将定陵封给侍中卫尉淳于长，立为侯国，王莽时改名为定城。 [/INST] 汝水又东南，径定陵县故城北。汉成帝元延三年，封侍中、卫尉淳于长为侯国，王莽更之曰定城矣。</s>
将以下现代汉语文本改写为文言文: 汝水又往东南流经定陵县老城北面，汉成帝元延三年前，将定陵封给侍中卫尉淳于长，立为侯国，王莽时改名为定城。
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汝水又东南，径定陵县故城北。汉成帝元延三年，封侍中、卫尉淳于长为侯国，王莽更之曰定城矣。
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