要成为一个成功的复制因子，有三个关键特征：寿命、繁殖能力和准确度。
To be a successful replicator, there are three key characteristics: longevity, fecundity and fidelity.
从长远来看，养成一种新的性格特征可能会帮助你成为你想成为的人。
Over the long term, picking up a new character trait may help you move toward being the person you want to be.
在地球上任何一个特定地点，阳光的不断变化使能量储存成为地球太阳能系统的一个必要设计特征。
Constant variations in the amount of sunlight available on Earth at any given location make energy storage a necessary design feature of terrestrial solar-energy systems.
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