“Culverts in ancient China”的概念、定义、翻译、参考文献-科学参考

单词	Culverts in ancient China
释义	Culverts in ancient China Encyclopedia 理学　　　　古代涵管释 Culverts in ancient China　　　　古代涵管古代又称瓦窦、涵洞，修在塘堰或渠道的堤岸中，用于向农田放水；建于大江大河、湖泊的堤岸中，用于泄水、淤灌等；或建于古城城墙中，用于城市供排水。涵洞可为开敞式，也可设闸门节制。
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