  The transition mechanism of metal-insulator in metal oxides is discussed in
detail, which is a part of the mechanism of superconductivity. Through the
study of magic angle twisted bilayer graphene superconductor and other new
findings on superconductivity, we further demonstrate that the physical
mechanism of superconductivity proposed in Part I is the only correct way to
handle the properties of superconductivity in various materials. We propose
that superfluid helium consists of normal liquid helium mixed with high-energy
helium atoms. Based on this new model, all peculiar features discovered in
superfluid helium can be truly understood, such as the climb of superfluid
helium on the container's wall, the fountain effect, the discontinuity of
specific heat capacity at phase transition point, and the maintaining mass
current in a ring-shaped container. We demonstrate that the high-energy
particles play a driving force role in both superconductors and superfluid
helium, and therefore dominate their properties.
