可能是由于视觉系统进化，使得我们对些微高于水平面的物体过度敏感，以此帮助我们挺直腰杆。

Perhaps it's because our visual system evolved to be overly sensitive to even slight departures from the horizontal, to help keep us upright.

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你会不会采用诸如页眉、水平线、首字下沉之类的视觉引导？

Will you use eyebrows, decks, initial caps, and other visual cues?

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他们的系统能够分析户外场景的相片，将“天空”与“地面”识别开，并且寻找视觉线索来区分水平面与垂直面。

Their system analyses photographs of outdoor scenes, identifies “sky” and “ground” regions, and looks for visual cues that distinguish horizontal surfaces from vertical ones.

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