这些柱子不是垂直的，从远处看，视觉上的错觉看来笔直，水平面是这样。 柱子则是这样延伸。
The pillars, they are not straight, but it’s giving the optical illusion that from a distance looks perfectly straight.
星期二早些时候，一些物理学家说，他们相信那道轨迹是飞行器留下的，而且，在天气晴朗时，由于人的错觉，蒸汽会显得像是垂直上升的。
Some physicists said earlier on Tuesday they believed the trail had been left by an aircraft, and that on a clear day vapour can appear to rise vertically as the result of an optical illusion.
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