(keep sb.from doing sth.) (be stopped from doing sth.)和(stop

stop sb (from) doing sth = keep sb from doing sth,没有区别.
但不等于 keep sb doing sth = let sb continue doing sth,意思相反,让……继续/不停地做……
再问： 那be stopped from doing sth.呢？？？
再答： 这不过是被动语态，意思一样。 We must stop hunters from killing wild animals. Hunters must be stopped from killing wild animals.