Perhaps it's because our visual system evolved to be overly sensitive to even slight departures from the horizontal, to help keep us upright.
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。
A rest shall be placed at the end of a row of books to keep them upright.
一排书的末端应放个支撑物以使书本保持直立。
To be safe, you should bring your seat backs to an upright position and keep your seat belts fastened during take-off and landing.
为了安全起见，在飞机起飞和着陆时，您应将座椅靠背调直，系好安全带。
She is believed to have been in constant pain because of the condition, and needed to be in the plastic bowl in order to keep herself upright.
她一直遭受病痛的折磨，她需要坐在塑料盆里以保持身体直立。
She is believed to have been in constant pain because of the condition, and needed to be in the plastic bowl in order to keep herself upright.
她一直遭受病痛的折磨，她需要坐在塑料盆里以保持身体直立。
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