Why the three biggest vaccine makers failed on Covid-19
为什么三大疫苗制造商折戟新冠疫苗

GlaxoSmithKline, Merck and Sanofi are left playing catch-up to upstarts with new technology
葛兰素史克、默克和赛诺菲，现在都只能望着那些拥有新技术的新贵绝尘而去。