Abstract
We explain why the isotropic metric is quite appropriate to put the physical meaning of spacial variables in the theory of general relativity. Using the isotropic metric, we conclude that i)g_{00} does not become positive even inside the black hole, ii) there exists the center of the Universe if the curvature of the Universe k \ne 0, iii)the Universe is spacially finite but not colsed for k>0.
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