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Technically you need the extra dimensions. At first people didn't like them too much, but they've got a big benefit, which is that the ability of string theory to describe all the elementary particles and their forces along with gravity depends on using the extra dimensions.

从技术上讲，你需要额外的尺寸。起初人们不太喜欢它们，但它们有一个很大的好处，那就是弦理论描述所有基本粒子的能力以及它们的力和重力依赖于使用额外的维度。

— Edward Witten 爱德华·维特恩