It's unpopular to apply sustainability to the concept of population growth, as the word "population" evokes worries about state control and limits on reproductive freedom.

由于“人口”这个词会导致对于国家控制以及生育自由限制方面的忧虑，将可持续性加到人口增长的概念上并不为人所乐见。

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But for some 5 to 7 percent of the population even basic math—like the concept of the numbers 5 and 7—causes anxiety.

但是对于那5%-7%的人来说，甚至连诸如数字5和7的概念这么简单的数学都会引起焦虑。

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As we all know that information literacy is a hierarchic concept, and different population has different information literacy level.

众所周知，信息素质是一个分层次的概念，对不同群体的信息素质要求不应该也不可能完全统一。

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They think that if the land is owned then it will be protected and respected more because the general population needs the concept of private ownership to care about the environment.

BBC: Survey finds opposition to privatisation of forests

The first test market for his concept was Israel, where 80 percent of the population lives in a narrow, densely populated stretch along the Mediterranean coast, making it a perfect laboratory for such a charging network.

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For Romney, who probably knows more about personal income taxes than most Americans, the concept behind his statements is not only a flim-flam, it implies that somehow half the population is not working and on the dole.

FORBES: Time to Occupy Mitt Romney