如果宇宙弦存在，每根弦都像质子一样小，密度却极大。
If they exist, each string would be as thin as a proton, but incredibly dense.
超弦理论以这个观点为基础，并从下向上构筑了整个宇宙。
Superstring theories take this idea and build the entire universe from the bottom up.
超弦理论以这个观点为基础，并从下向上构筑了整个宇宙。
Superstring theories take this idea and build the entire universe from the bottom up.
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