比方说，质子是由两个上夸克（up quark）和一个下夸克（down quark）组成的束缚态，而奇异粒子只不过是含有奇异夸克（strange quark）的束缚态。（然而，我们不可能观测到单个夸克或胶子。
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Down-Quark 下夸克
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.
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%。
When you go below atomic size and get down to quarks, you drop off the periodic table and start playing with James Joyce who coined the word "quark."
当你从原子那么大再想到夸克，放下元素周期表跟发明了“夸克”这个词的詹姆斯 乔伊斯一起玩儿。
The phenomenological constraints on the down-quark mass matrix in the weak interaction base were investigated.
在夸克的弱相互作用基下，得到了下夸克质量矩阵的唯象约束条件。
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