Over a century after its discovery, the proton still keeps physicists busy understanding its basic properties, but a new generation of experiments may help finally nail down its radius, stability and the origin of its spin.

中文翻译：

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质子难题

质子发现后的一个多世纪，仍然让物理学家们忙于了解其基本性质，但是新一代的实验可能最终有助于确定其半径，稳定性和自旋的起源。