弦理论最初是为了解释强相互作用力，也就是二次共振模型（1969）。
The theory has its origins in an effort to understand the strong force, the dual resonance model (1969).
其结果支持了光学模型势在奇异原子中应用的正确性，进而表明核子问的强相互作用力为吸引力。
The result coincides with the experimental date and supports greatly the optical model potential in the application of mesonic atom.
众所周知，在自然界中有四种基本的相互作用力：电磁力、强相互作用力、弱相互作用力和万有引力。
Well, as you all know, there are four fundamental forces in physics: electromagnetism, strong nuclear interaction, weak nuclear interaction and gravity.
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