在我们的宇宙中，底夸克的质量大约是顶夸克的两倍，造成中子比质子重大约0.1%。
In our universe, the down quark is about twice as heavy as the up quark, resulting in neutrons that are 0.1 percent heavier than protons.
Jaffe和他的同事建立了一个类型的宇宙，其中底夸克比顶夸克轻，而质子比中子重1%。
Jaffe and his colleagues modeled one family of universes in which the down quark was lighter than the up quark, and protons were up to a percent heavier than neutrons.
强核力的一部分也由中子提供，在大多数原子核内，中子比质子数量多，并且不带电荷。
Some of this force is also supplied by neutrons, which outnumber protons in most nuclei and have no electric charge.
为什么电子比质子或中子活动更大？这是因为电子质量轻，结合力弱的缘故。
Why are electrons more mobile than protons or neutrons? It is BE cause they have lighter mass and less firm binding.
中子是中性的，比质子略重。
中子是中性的，比质子略重。
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