| 单词 | bottom quark |
| 释义 | bottom quark [`bäd·ǝm ´kwärk] PARTICLE PHYSICS A quark with a mass of about 4.7 GeV, electric charge of -1/3, zero isotopic spin, strangeness and charm, and a new quantum number associated with it. Also known as b quark; beauty quark. Symbolized b. |
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