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.
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第四十一条 仲裁文件应当以当事人约定的合理方式送达；当事人没有约定或者约定不明确的，按照仲裁规则规定的方式送达。
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