在城市及工厂的地下管线中，许多重要的管线是用金属材料制成的。
Many important underground pipelines are made of metal materials in cities and factories.
用金属材料制成的一体化可动结构和叠层式压电元件可组成蛇型步进式直线驱动器，能实现高精度、高可靠性的直线步进驱动。
The snake-step linear actuator is constructed based on the integrated moving structure made by metal and the stack PZT, it can achieve the line-step moving of high accuracy and high reliability.
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