请问 protect defend guard preserve的区别

请问 protect defend guard preserve的区别 defend,guard,preserve,keep的区别 pretect/defend/guard/preserve四者区别? [英语]词义分辨guard 和 defend 和 protect 的区别 求：preserve ,defend ,protect ,prevent的区别和各自用法.详 protect,prevent,preserve 的区别 preserve sb.和protect sb.的区别 prevent,protect,guard,defend好像都是防御的意思,有什么不同么? 如何区别protect和preserve 求protect,prevent,defend+sb from doing的区别 preserve&reserve 的区别 preserve reserve的区别