By taxing about some over-exploitation populations how to restore optimal population level is moderately studied.

对系统某些种群因捕获造成过度开发，如何通过征税恢复最优种群水平作了适当的研究；

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When people did not enjoy long retirements and population growth was rapid, the optimal amount of government debt was zero.

过去的人们不能享受长时间退休，人口又出现迅速的增长，那时国债的最优化数额就是零了。

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In this paper, the existence of the optimal harvesting control for a class of non-linear population system is proved.

研究了一类半线性时变种群扩散系统的最优收获问题，证明了最优收获控制的存在性。

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They end up with assemblies or parliaments of that size because, the argument goes, the cube root of the population is the optimal size.

BBC: Incongruous, inconsistent, irrational