He is going to be away from Wuhan for two weeks.

这句话后面有加for two weeks,leave是短暂性动词,不能接这样的时间段性的东西.“离开”away是延续性动词.可以be away from是替代leave的固定用法,类似的,如果也是后面有时间段的,begin 换成be on.例,这部电影开始一小时了.就不能说是the movie has begun for one hour,应该换成the movie has been on for one hour.