First, with object-oriented thought, we divide the underground pipeline system level to clarify the pipe system hierarchy and rend different level category pipeline data.
首先，根据面向对象的思想，划分地下管线系统层次，理清管线系统数据间的关系，并对管线系统的数据进行分层渲染；
Valves are technically pipe fittings, but are usually discussed as a separate category.
排气阀在技术上管件，但通常是作为一个单独的讨论范畴。
My company produced aluminum-plastic composite pipe including toothpaste tube, on the supplies of chemical, food tube, the drug category, a wide range of uses.
我公司生产的铝塑复合管包括 牙膏管、日化化工用品管、食品类管、药品类管，用途广泛。
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