《明史·志·卷六十三》
陈埴开通清江浦，于是，修筑高家堰旧堤来保护它。
陈瑄凿清江浦，因筑高家堰旧堤以障之。
Chen Zhi opened up the Qingjiangpu, so the old Gaojia embankment was repaired to protect it.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 陈瑄凿清江浦，因筑高家堰旧堤以障之。 [/INST] Chen Zhi opened up the Qingjiangpu, so the old Gaojia embankment was repaired to protect it.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 陈瑄凿清江浦，因筑高家堰旧堤以障之。
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Chen Zhi opened up the Qingjiangpu, so the old Gaojia embankment was repaired to protect it.
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