A correct definition of time in unitary 4D xyzt space has been never found. Time is not a scalar number. Time is a four component vector tx,ty,tz,tt. The above definition has been working efficiently in solving classical/quantum physics and mathematics efficienlty since 2020 via the statistical method of Cairo techniques. Here we show that how this four components definition on time: t=tx,ty,tz,tt brings up  for the first time a straight forward solution for Einstein general relativity and curvature of sound waves inside controlled volume subject to Dirichlet boundary conditions.

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