This book comprehensively and systematically fulfills the epoch-making revolution in physics from postulate-based modern physics to mechanism-revealed physics by fully establishing and verifying the Mechanism-Revealed Theory System of Physics, and completely solving the long-standing fundamentally important problems, e.g., dark matter, dark energy, the Higgs boson, the cosmological constant, high-temperature superconductivity, the Pioneer anomaly, ultrahigh-energy cosmic rays, gamma ray bursts, the GZK paradox, gravitational wave/graviton... This book (i.e., Mechanism-Revealed Physics) terminates the era in which quantum mechanics does not and cannot know why there are quantum states, Einstein's postulate-based relativity does not and cannot know why time and space are variable thus relative. Mechanism-revealed physics has great applications...