We're all familiar with the high-pitched squeak of basketball shoes on the court during games, or tires squealing on pavement. Scientists conducted several experiments and discovered that the geometry of the sneakers' tread patterns determines the squeak's frequency, enabling the team to make rubber blocks set to specific frequencies and slide them across glass surfaces to play Star Wars' "Imperial March."
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（五）其他实施流量造假，扰乱网络秩序等行为。
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缺点：容易饱和（输入过大或过小时梯度接近0，导致梯度消失）