Many methods have been put forward by this time . all these methods are based on biology evolutionary theory of darwen that the superior individual will be held and the inferior one will be eliminated 现今已经发展出很多方法，但其原理大都来自于自然界生物演化的机制? ?就是生物学家达尔文提出的“物竞天择，适者生存”的演化论。
