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).
尽管目前有了很多关于核力，核子-核子相互作用甚至是强相互作用的理论，但是各种理论或模型都或多或少地存在一些困难。
At present, though there are many theories about nuclear power and nucleon-nucleon interaction, more difficulties exist in both of these theories or models more or less.
荷电粒子会因为与强朗缪尔湍动的相互作用而得到加速，经过理论推导发现电子和质子能否得到加速与朗缪尔湍动强度有关。
After analyzing the interaction between charge particles and strong Langmuir turbulence we find whether the protons and electron can be accelerated is relevant to the intensity of Langmuir turbulence.
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