Quarks, which we also cannot see, are a model to explain the properties of the protons and neutrons in the nucleus of an atom.
夸克同样看不到，但它却是解释原子核中质子、中子性质的理论模型。
Quarks, which we also cannot see, are a model to explain the properties of the protons and neutrons in the nucleus of an atom.
夸克同样看不到，但它却是解释原子核中质子、中子性质的理论模型。
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