What we know about the coronavirus, called 2019 nCoV, changes hour by hour, making it hard to predict how far the virus might spread and how many people could become infected.

我們對於叫做 2019 nCoV 冠狀病毒的了解每一刻都在改變，使得我們難以預測這個病毒究竟能傳播多遠、能感染多少人。