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1. The plectonemic spiral is a model that describes the behavior of particles in a fluid.
质子螺旋模型描述了粒子在流体中的行为。
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2. The plectonemic spiral is used to study the motion of molecules in a liquid.
质子螺旋用于研究液体中分子的运动。
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3. In this model, the plectonemic spiral represents the distribution of protons in the nucleus of an atom.
在这个模型中,质子螺旋代表了原子核中质子的分布。