交变作用可以由带电区域或探针运动而形成，也可以在探针前面或后面，安装一断续器产生交变作用。

The alteration can be created by moving the charges region or probe, or by placing a chopper either before or after the probe.

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丝杠冷打是在工具和丝杠高速相对运动中，以高速断续的方式击打丝杠轴坯，使丝杆轴坯局部塑性变形形成丝杠螺纹的一种无屑塑性成形技术。

Cold beating lead screw plays the role of high-speed relative motion in the way of high-speed blowing shaft blanks, so that local plastic deformation forms a non-chip metal forming technique.

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当然，正是对棉花种植可观回报的预期引发了大规模的断续的西南部开发运动。

It was, of course, the favorable returns expected on cotton cultivation that brought the great, irregular surges of movement toward the southwest.

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