These are materials which can translate electrical fields into mechanical stress, or vice versa.
这类物质可将电场和机械压力相互转换。
In the electrical control fields, PC has become one of the most important control device.
在电气控制领域中，可编程序控制器（PC）已成为一种不可替代的核心控制器件。
In the electrical control fields, PC has become one of the most important control device.
在电气控制领域中，可编程序控制器（PC）已成为一种不可替代的核心控制器件。
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