出油管线最普遍地由钢管组成，不过也使用玻璃纤维管、水泥衬里钢管以及柔性塑料管。
Steel pipe is the most common, but fiberglass pipe, cement-lined steel pipe, and flexible plastic pipe are also used.
由于本发明的设计非常简单，因此可以用柔性塑料材料制造它和用此装置作为一次性系统。
As the design of the invention is very simple, it is possible to manufacture it with flexible plastic material and use the apparatus as a disposable system.
PVC不是一种柔性的塑料，因此要加入一种叫邻苯二甲酸盐 的化学物质，使它变的更柔软。
To begin with, it's not a soft plastic, so phthalates are added to make it more pliable.
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