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).
结果表明，三波共振和二次失稳这两种机制都存在。
The results show that mechanisms of both resonant triad and secondary instability do exist.
研究结果的二次磁共振成像终点一般都符合首先观察终点中出现的好转，这局限于0.5毫克组患者当中。
Results of the study's secondary MRI end points were generally consistent with reductions seen in the primary end point, which was limited to patients in the 0.5-mg group.
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