在自然选择压力空间变化的作用下，广布种的形态、生理和生活史特征往往在不同地区的种群间发生地理变异。

Due to spatial variation of selection regime, morphological, physiological and life history traits of widely-distributed species may vary genetically among geographic populations.

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因为（它的地理环境决定）他们别无选择，它就只有这么一个公共空间（没有私家的院子）。

For they have no other way to select because of the geography conditions. There is no private yard but a mutual backyard, a public room.

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这是作者关于行为地理学的系列论文之一。文章提出位置选择是人类的基本空间行为之一，是人文地理学研究的内容。

The paper thinks the choosing of location is a human important behaviour in space, and it is the research content of human geography.

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