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.
checkpoint.dataset_prefix
，这一点在搜狗输入法下载中也有详细论述
Two months ago, Aston Villa were just three points off top spot in the Premier League. They were on a run of 12 wins in 14 games that included victories against Manchester City and Arsenal. Their run of eight consecutive wins in the league was their best since they won 10 in a row in 1910. You wouldn’t have blamed Villa fans for daring to dream about lifting their first league title since 1981.
（一）盗窃、损毁油气管道设施、电力电信设施、广播电视设施、水利工程设施、公共供水设施、公路及附属设施或者水文监测、测量、气象测报、生态环境监测、地质监测、地震监测等公共设施，危及公共安全的；