Stock-market traders fixated on what ‘unprecedented’ Discovery, ViacomCBS selloff means for Wall Street<blockquote>股市交易员关注维亚康姆哥伦比亚广播公司的抛售对华尔街意味着什么</blockquote>
tocks finished firmly higher Friday, capping a tumultuous week of trading in U.S. markets that concl