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发帖数: 99 | 1 What is string theory?
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There are two basic types of string theories: those with closed string
loops that break into open strings, and those with closed string loops
that don't break into open strings
Think of a guitar string that has been tuned by stretching the string
under tension across the guitar. Depending on how the string is
plucked and how much tension is in the string, different musical notes
will be created by the string. These musical notes could be said to be
excitation modes of |
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