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.
非法携带枪支、弹药或者弩、匕首等国家规定的管制器具进入公共场所或者公共交通工具的，处五日以上十日以下拘留，可以并处一千元以下罚款。
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"The Dutch are rich and they work less – but the question is, how sustainable is this?" says Nicolas Gonne, economist at the OECD. "There's only so much you can do with few workers.