| 单词 | quark |
| 释义 | quark (once / 39663 pages) 1n 2n A quark is an elementary particle with an electric charge. When quarks combine, they form another type of particle called a "hadron." If you want to learn more, take up particle physics. Quarks are held together by what physicists call "the strong force" or "the strong nuclear force." The most stable of these quark combinations, or hadrons, are protons and neutrons — the basic building blocks of atoms. In the 1960s, a physicist named Murray Gell-Mann named these particles from a favorite made-up word in James Joyce's book "Finnegan's Wake," quark. Gell-Mann's partner reportedly preferred the word ace. WORD FAMILYquark: antiquark, quarks USAGE EXAMPLESIn 1908, none of the following terms had even been invented: big bang, black hole, antimatter, quark, laser, neutron star, or quantum mechanics. Science Magazine(Oct 26, 2016) With its bona fides established, the Eightfold Way led to quarks, gluons and ultimately the Standard Model, a chart with its own holes to fill. New York Times(Oct 17, 2016) The theory suggests that fundamental particles called quarks have a hidden axial symmetry. Nature(Sep 27, 2016) 1 n (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 2quarks have not been observed directly but theoretical predictions based on their existence have been confirmed experimentally Hypo|Hyper beauty quark, bottom quark a quark with a charge of -1/3 and a mass about 10,000 times that of an electron charm quarka quark with an electric charge of +2/3 and a mass 2900 times that of an electron and a charm of +1 down quarka stable quark with an electric charge of -1/3 and a mass 607 times that of an electron squark, strange quarka quark with an electric charge of -1/3 and a mass 988 times that of an electron and a strangeness of -1 top quark, truth quarka hypothetical quark with a charge of +2/3 and a mass more than 100,000 times that of an electron up quarka stable quark with an electric charge of +2/3 and a mass 607 times that of an electron elementary particle, fundamental particle (physics) a particle that is less complex than an atom; regarded as constituents of all matter n fresh unripened cheese of a smooth texture made from pasteurized milk, a starter, and rennet Syn|Hyper quark cheese cheese a solid food prepared from the pressed curd of milk |
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