likely和earthly（adj.可能的）的区别？
earthly 用的比较少，用法单一
no earthly reason/use etc.
I see no earthly reason why he shouldn't come.
我没有看到可能的原因，为什么他不能来
likely做可能的，用法比较广泛
something that is likely will probably happen or is probably true
Snow showers are likely tomorrow.
the most likely cause of the problem