为什么爱恩斯坦说恒星的影像是环，而非点？
Why did Einstein say that the image of a star could be a ring instead of a point?
肖像是根据爱恩斯坦应邀出席牛津大学授予他荣誉博士称号的照片资料而创作的，他当时身着博士学位特别的长袍，手拿博士方形帽子。
This portrait is created according to the photo of Einstein who was present in Oxford University who award him honoured doctorate. He was in the special gown with the quadrate cap in his hand.
物质世界无限，包括空间与时间。在物质世界中，有爱恩·斯坦方程。
The material world is infinite including space and time. In this world, there is Einstan's equation.
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