First, the string and superstring are introduced. Next, some theories on particle physics are researched. Third, we propose the emergence string, which may derive the mass formulas of particles, etc. We study the extended superstring, which as a beautiful mathematical tool may be applied widely. Fourth, the unification of four interactions is searched. It includes the simplified supersymmetry. Fifth, we discuss neutrinos and their oscillation, in which some problems must be researched. Finally, some aspects of particle physics are discussed. String and superstring are the important method in physics.
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