trouble:to cause inconvenience or discomfort 这里主要学习它的动词形式。想当于worry和concern。
最困扰很多二线城市的是人才的短缺。
翻译：A few second-tier cities are most troubled by the lack of talents.
参考翻译：What troubles many second-tier cities the most is a shortage of talent.
场景1：医生上夜班 This woman doctor was increasingly troubled by the night shifts.
场景2：山城遭受自然灾害 What troubles the small mountain town the most is the constant flash floods and mudslides.
补昨天的
upend：to turn something upside down.
本单词表示“颠覆”，也常用来表示“巨大的变化”，可以理解为“颠覆”一个行业的常规和现状。这是《经济学人》偏爱的用词之一。
科技已经颠覆了出版社
翻译： Technology has already upended the publishing industry.
场景1：Alibaba has upended the electronic commerce.
场景2：Online payment, say Alipay and Wechat payment, has upended the traditional payment method.
