由于某种不当原因，或者是在某种哲学时刻，那人决定星期二走进教室，给你们上哲学课。

For whatever perverse reasons, maybe to make some sort of philosophical point, that person decides to come in anyway on Tuesday and lecture to you about philosophy.

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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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由于一次太阳风的爆炸，来自太阳的带电粒子，在星期二撞击了地球。从而引发了极光现象，最南边到密西根州都可观察到，这张照片是在马奎特的苏必利尔湖沿岸拍摄的。

A burst of solar wind-charged particles from the sun-struck Earth on Tuesday, triggering auroras as far south as Michigan, as seen in this picture taken from the shores of Lake Superior in Marquette.

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