请问destroy,damage,ruin有什么区别？

1.destroy 强调以具有摧毁或杀伤性的力量把某物彻底毁掉。
Why, you may wonder,should spiders be our friends? Because they destroy so many insects,…
你也许会觉得奇异，蜘蛛怎么竟是我们的朋友？因为它们毁灭那么多的昆虫。
As long ago as the fourteenth century,an Englishman,Sir John Hawkood, made the remarkable discovery that people would rather pay large sums of money than have their life work destroyed by gangsters.
早在14世纪，一位名叫约翰·霍克伍德爵士的英国人，就有过非凡的发现：人们宁肯支付大笔金钱也不肯把自己毕生的事业让暴徒毁掉。

2. ruin 亦指彻底毁掉，但不含有以某种摧毁性的力量进行破坏，而含有在一定的过程中逐渐毁掉的意思
Oxford has been ruined by the motor industry.
牛津城已经被汽车工业毁掉了。
The crops are nearly ruined by the continuous rain.
继续不断的雨水几乎毁坏了这些农作物。

3.damage是破坏，常常是局部的，或可以修好的。
The storm did a lot of damage to the crops.
暴风雨使庄稼受到了很大损失。