在经过一定的时间后，有部分比例的模拟人开始繁育后代。老一辈死去后，新的一代接管他们的交易。
After a certain amount of time the agents reproduced in proportion to their accumulated fitness; the old generation died, and the young took over.
虽然在一定重量和体积下，它们的储能不及新一代技术，但是它们也许是非常符合成本效益的。
Although they cannot store as much energy for a given weight or volume as newer technologies, they can be extremely cost-effective.
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