英语翻译我们说任何事情的发展都有一个度,对这个度把握得恰到好处,就有利于事物的发展；若超过了这个度,就会适得其反,带来坏处.自私也是一样,人的自私控制在一定范围,是人本身生存和发展的需要,如果任其泛滥,就会像洪水猛兽,给自己带来无穷无尽的灾难.翻译成英文,

呵呵
Everything has a degree of development, on the degree to grasp just right, will be conducive to the development of things; if more than this degree would be counter-productive to bring harm. The same selfish, selfish people in a range, is a human survival and development needs of their own, if allowed to spread, will be like a scourge, bring on the endless disasters
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There will be a limitation for the development of anything.If the limitation is approriately taken control,things will run smoothly.Contrarily,if the limitation is broken through,things will go bad.People's selfishness is just as what the above depicts.It is necessary to control the selfishness to a certain degree to leave room for people's living and improvement.When the selfishness is out of control,it will be like flood,bringing about endless disaster.