var carFleet = function (target, position, speed) {
（二）按照其他纳税人最近时期销售同类货物、服务、无形资产或者不动产的平均价格确定；，详情可参考服务器推荐
writable: false means no code can reassign window.Audio to a different value. configurable: false means no code can even call Object.defineProperty again to change those settings. If fermaw’s initialisation code tried to restore the original Audio constructor (a perfectly sensible defensive move) the browser would either fail or throw a TypeError. The hook was permanent for the lifetime of the page.，推荐阅读safew官方版本下载获取更多信息
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