Look at the Mechanism Behind the Postulate of the Equivalence Principle: The Mechanism Behind This Extremely Important Postulate Has Been Revealed

"Hi, dear general relativity, are you interested in the mechanism behind your famous postulate of the equivalence principle?" a physicist saluted and chatted with the theory of general relativity."Yes, of course In fact, for the entire last century, I have been constantly thinking over and pondering the questions of whether there is the mechanism behind the postulate of the equivalence principle, and what this mechanism is if it really exists; but I haven't found out this mechanism," general relativity replied clearly and specifically."Why are you so interested in the mechanism behind the postulate of the equivalence principle?" the physicist asked."Because this postulate is not only crucially important for me, but also absolutely indispensable to me; moreover, this postulate is literally my heart and soul. And so, if there is the mechanism behind this postulate, this mechanism is, or must be, crucially or remarkably important; thus knowing this mechanism is of profound and great significance. Do you have any information about the mechanism behind this postulate?" general relativity answered and asked."Yes. The mechanism behind this postulate has been revealed; and this mechanism has been introduced in this book," the physicist answered clearly and directly."Oh Really?" general relativity became obviously surprised and excited."Yes Really and surely," the physicist assured calmly."Then I must read this book earnestly," general relativity said firmly.