英文：An isotope of hydrogen with one proton and one neutron in the nucleus having an atomic weight of2.014.
中文：氘氢的一种同位素，在其原子核内有一个质子和一个中子，其原子重量为2。014
英文：A proton or a neutron, especially as part of an atomic nucleus.
中文：核子质子或中心，尤指作为原子核的一个组成部分
英文：A particle, such as an electron, a proton, or a neutron, having half-integral spin and obeying statistical rules requiring that not more than one in a set of identical particles may occupy a particular quantum state.
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