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Used when jerking motion is needed in mechanical industry.
机械工业中，需要产生冲击运动的场合。
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The aircraft was bumping up and down and jerking left to right.
我们的机舱忽上忽下，左右摇晃。
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The aircraft was bumping up and down and jerking left to right.
我们的机舱忽上忽下，左右摇晃。
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