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neutrons
A neutron is an atomic particle that has no electrical charge.
Each atomic cluster is made up of neutrons and protons.
原子团簇是由中子和质子构成的。
A typical neutron star is a mere 20 km in diameter, but contains as much mass as one or two Suns.
一个典型的中子星直径不过20公里，但却包含了相当于一个或两个太阳的质量。
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