城里甚至还敷设了排水系统，因为在狭窄的街道底下发现了许许多多陶土制作的排水管道。

The city was equipped with a drainage system, for a great many clay pipes were found beneath the narrow streets.

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介绍了系统的布置方法及回水管的几种敷设形式。

Presents the arrangement method of this system and layout types of its return pipes.

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该系统比较适合于旧供暖系统的改造。介绍了系统的布置方法及回水管的几种敷设形式。

This kind of system is suitable for reform of old systems. Presents the arrangement method of this system and layout types of its return pipes.

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