In the view of superstring theory, string is the most basic unit and all the elemental particle which formed the universe, for example, electron, photon, quark and neutrino are its specific states.

• 在弦理论看来，弦是宇宙物质组成的最基本单元，所有的基本粒子如电子、光子、夸克、中微子都是它的不同具体形态。