2020-02-13 美国应该重视流感

stalk --- If something unpleasant stalks a place, it appears there in a threatening way.
influenza --- 流感
take hold --- to begin to have completely controlled over somebody or something.
on alert --- 处于警戒状态
the novel coronavirus --- 新冠病毒
pick up --- to get stronger
surge --- a sudden increase
strain --- 疾病类型、压力、拉伤
gravely --- 严峻的、重大的
uptick --- 小幅增加
kick off --- 开始
lament --- to express regret or disappointment over sth. considered unsatisfactory, unreasonable or unfair
vaccination --- 接种疫苗
substantial --- significant