| 单词 | down quark |
| 释义 | down quark (extremely rare) n WORD FAMILY down quark USAGE EXAMPLESA proton contains two up quarks and one down quark; a neutron contains two down and one up. Stephen Hawking, A Brief History of Time: And Other...(1988) The exotic pentaquarks they observed are made up of two up quarks, one down quark, one charm quark and one anti-charm quark. The Guardian(Jul 14, 2015) Both particles contain one beauty, or b, quark, one strange quark and one down quark. Scientific American(Feb 12, 2015) n a stable quark with an electric charge of -1/3 and a mass 607 times that of an electron Hyper quark (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 |
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