Zhanlikui,
I replied to your request for comments and don't know wether you have seen it or not before I realized that my reply had been missing. But don't worry, you are very nice and I will try do my best for you. i have a feel that we have different tastes that make comments on each other harder.
Thanks for now.
xshi
Dear Xshi, would you like to help to edit the following word? MANY THANKS!!
Introduction
In theory, a gravitational singularity should have zero volume and infinite density. Many scientists have made various attempts to uncover the secrets of the singularity. Today, much breakthrough has been made in this area of research, and a black hole does not mean absolutely darkened [1,2]. True, there still remain quite a number of problems about the universe to be tackled [3,4]. The evidence of dark energy and dark matter remain to be answered [5,6]. The truth of black holes has yet to be confirmed [7]. Here, we attempt to discuss to refer to gravitation from energy perspective. For simplicity, the nouns and terms that we use conform to the definitions of fundamental physics. The “clock” is a timepiece in the physical sense; some examples include an atomic clock, a mechanical clock, a quartz clock or another chronometric instrument, excluding a gravity pendulum which cannot work in outer space. The “ruler” is a length-measuring tool in the physical sense; some examples include a meter stick or another instrument that measures dimensions. “Mass” is a measure of an object's resistance to a change in its state of motion when a force is applied.
Best regard! Your frend, Zhan Likui. http://blog.sciencenet.cn/u/zhanlikui