This bar naturally vibrates at 3.145 MHz, but apply an alternating voltage and it vibrates more quickly or slowly.
这种硅条自然的震动于3.145 MHz的频率，不过当施加一个交变电流的时候，它的震动会变快或变慢。
The super needle bar stroke and super alternating presser foot make its feature of heavy duty sewing even more outstanding;
超长针杆行程，大互动量交替压脚，缝厚能力更显出色；
The prime motor rotates in a fixed direction and the alternating motion of the carrier bar is accomplished by the crank-rocker mechanism.
电动机单向旋转，用曲柄摇杆机构换向，实现悬点的往复直线运动。
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