求：preserve ,defend ,protect ,prevent的区别和各自用法.详

求：preserve ,defend ,protect ,prevent的区别和各自用法.详 protect,prevent,preserve 的区别 请问 protect defend guard preserve的区别 求protect,prevent,defend+sb from doing的区别 preserve sb.和protect sb.的区别 defend,guard,preserve,keep的区别 如何区别protect和preserve protect和preserve都有保护的意思,两者用法上有什么区别 prevent和protect区别 [英语]词义分辨guard 和 defend 和 protect 的区别 protect 与 prevent的区别 PROTECT,DEFEND,DEFEAT在意义和用法上有何区别?