求protect,prevent,defend+sb from doing的区别

求protect,prevent,defend+sb from doing的区别 求：preserve ,defend ,protect ,prevent的区别和各自用法.详 prevent sb.doing sth.\stop sb.from doing sth\keep\protect有什么 protect sb from doing prevent sb from doing的from可以省略吗 prevent from keep off protect from区别 英语高手请进在stop /prevent/protect sb from doing中,哪个短语中的from可以省略 请问 protect defend guard preserve的区别 protect 与 prevent的区别 protect,prevent,preserve 的区别 prevent sb/sth from doing造句 prevent sb from doing sth 告诉一下怎么个用法.不必告诉与其他词组的区别