名词
中文翻译：中子与质子质量差
同义词：
['neutron-proton massdifference', 'neutron-protonmass difference', 'neutron-proton mass difference']
例句：
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1.The mass difference between the two stars isso small that it can be easily overlooked.
两颗恒星的质量差如此之小，以至于很容易被忽略。
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2. The mass difference between the twoplanets is so small that they areconsidered to be similar in size.
两颗行星的质量差如此之小，以至于它们被认为是大小相似的。
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3. The mass difference between the twostars is used to calculate their relative orbits.
两颗恒星的质量差被用来计算它们的相对轨道。