Plastic pipes are often the cheapest and easiest to lay.
塑料水管通常是最便宜的也是最易安装的。
And their production machine belt and plastic pipes are more than 10 years of history.
并自己生产机用带及塑料管都有十多年的历史了。
The pipes should be made of plastic.
这些管子应该是用塑料制作的。
Pipes may be made of metal, cement, plastic, or bamboo.
水管可以由金属、水泥、塑料或竹子制成。
Pipes may be made of metal, cement, plastic, or bamboo.
水管可以由金属、水泥、塑料或竹子制成。
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