Atoms are made from a nucleus of protons and neutrons and a cloud of electrons.

原子是由质子和中子组成的原子核与围绕原子核的电子云构成的.

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Atoms are composed of protons and neutrons in a nucleus surrounded by a cloud of electrons.

原子由中子和质子构成,它们位于核子中,核子又被电子云所包围.

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