【正文快照】： 本文所涉及的近环（near-ring）N是指右近环，即N是一个具有两个二元运算“+”与“·”的集合，（N，+）是一个群（不必是阿贝尔群），（N，·）是一个半群，并且对...
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定义了变换近环，然后证明了任意一个有单位元的近环与它的变换近环同构；任意一个无零因子近环与它的变换近环同。
The commutation near ring defined, it is proved that the near ring of an arbitrary near ring with its unit dimension is isomorphous with its commutation near ring.
两个物体间距离越近，两者间的相互引力越大；但引力也作用于其自身，所以，在极小距离时开始反馈环。
The closer two objects are to each other, the stronger the gravitational attraction between them; but gravity also ACTS on itself, and as a result, at very small distances a feedback loop starts.
面纱星云也被称为天鹅座环，现在的视角跨度近3度，即大约6倍满月的直径。
Also known as the Cygnus Loop, the Veil Nebula now spans nearly 3 degrees or about 6 times the diameter of the full Moon.
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