Today, the scientific community comprehensively accepts adding many extra unverifiable things into reality, e.g. extra mass: dark matter, extra energy: dark energy, extra position: superposition, extra dimensions, or even extra parallel reality. Considering reality is not understood completely, adding something into reality's unknown part is indeed a shortcut for explaining inherent measured discrepancy, but such behaviors are likely to distort the instinct of reality. Here, we aim to explain all measured discrepancies without distorting reality. We report any inherent measured discrepancy involving an indirect measure method that relies on an artificially-defined equivalence, e.g. inertia mass indirectly measures mass via an equivalence between mass and force/acceleration. Time measure relies on an equivalence between time and some phenomena for reference, e.g. the swing of a pendulum, the fall of sands or electron jumping between two states. Since Galileo, mathematical equal sign is introduced so naturally between different physical properties. We argue that any such equivalence only holds true within a limited phenomena range. Although we summarized some method's application range, e.g. inertia mass can only apply to phenomena meeting 'macro, low-speed, inertia-system', we state such scattered descriptions collected from experience are not rigorous. Instead, we deduct a rigorous application range from principle and hence any inherent measured discrepancy results from the measured phenomena exceeding the method's application range, e.g. remote objects actually exceed the Doppler effect's application range. By ignoring this, large-scale red shift inevitably misleads us to the universe's accelerating expansion and the dark energy's existing necessity. Similarly, dark matter only logically exists to expand the dynamical mass' application range to cover the phenomena of most galaxies.