(physics) hypothetical truly fundamental particle in mesons and baryons; there are supposed to be six flavors of quarks (and their antiquarks), which come in pairs; each has an electric charge of +2/3 or -1/3;
"quarks have not been observed directly but theoretical predictions based on their existence have been confirmed experimentally"
fresh unripened cheese of a smooth texture made from pasteurized milk, a starter, and rennet
When a neutrino transforms a quark, a lepton is emitted. 当中微子使一种夸克转化为另一种夸克时，会发射出一个轻子。