When shoes slide across a floor, wave-like deformations of the sole can generate squeaking. The pitch of the squeak depends on the rate at which deformations are generated.
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Израиль нанес удар по Ирану09:28，推荐阅读爱思助手下载最新版本获取更多信息
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“We’re not exactly happy with the way they [Iran] negotiated. They cannot have nuclear weapons, and we’re not thrilled with the way they’re negotiating,” Trump told reporters.