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人依靠自己的力量人才能生存,不依靠自己的力量人就不能生存。 
The tears of the world are a constant quantity. For each one who begins to weep, somewhere else another stops. The same is true of the laugh.
It is not the strongest of the species that survives, nor the most intelligent that survives. It is the one that is most adaptable to change.