"自然指数"是个多义词，它可以指自然指数（数学名词）,自然指数（科研论文指数）。
自然指数（Nature Index）是依托于全球68本顶级期刊蜱虫观，基于前一年各科研机构在Nature系列、Science、Cell等68种自然科学类期刊上发表的研究型论文数量...
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往往对股权资产组合规模有个自然限制：如果资产规模过大，那就有点类似昂贵的指数型基金。
Often, there is a natural limit to the size of equity portfolios: if they become too big they start to resemble expensive index funds.
但事实上，对环境而言，所有肉食的生产所需资源是谷物和豆类生产的指数倍，此问题曾在几月前奥杜邦协会(Audubon Society，美国一保护野生动物和自然资源协会，译者注)的杂志上讨论过。
But in fact, environmentally, all meat requires exponentially more resources to produce than eating grains and beans, as eloquently discussed in the Audubon Society's magazine a few months back.
Malthus论证说，自然群体的数量是呈指数级增长的，而食物供应的增加却是呈线性的。
Malthus argued that natural populations grow at an exponential rate, whereas the increase in food supply is linear.
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