| 单词 | 轰击 |
| 释义 | 〔attack〕Bombard suggests showering with bombs or shells ( Bombard 指炸弹或炮弹轰击（ 〔californium〕A synthetic element produced in trace quantities by helium isotope bombardment of curium. All isotopes are radioactive, chiefly by emission of alpha particles. Atomic number 98; mass numbers 244 to 254; half-lives varying from 25 minutes to 800 years. See table at element 锎：一种合成元素，由氦同位素轰击锔可得到微量的这种元素。所有同位素均是放射性元素，主要放射出α粒子。原子序数98；原子量244到254；半衰期从25分钟到800年不等 参见 element〔plutonium〕A naturally radioactive, silvery, metallic transuranic element, occurring in uranium ores and produced artificially by neutron bombardment of uranium. Its longest-lived isotope is Pu 244 with a half-life of 76 million years. It is a radiological poison, specifically absorbed by bone marrow, and is used, especially the highly fissionable isotope Pu 239, as a reactor fuel and in nuclear weapons. Atomic number 94; melting point 640°C; boiling point 3,235°C; specific gravity 19.84; valence 3, 4, 5, 6. See table at element 钚：一种天然地放射性银色超铀金属元素，存在于铀矿中，对铀元素进行中子轰击而人工制成。其存在周期最长的同位素是半衰期为七千六百万年的钸244，它是一种核辐射毒素，特别是能被骨髓吸收。尤其是其极具可裂变性的同位素钸239，被用作一种核反应燃料并用在核武器中。原子序数94；熔点640°C；沸点3,235°C；比重19.84；化合价3, 4, 5, 6 参见 element〔pelt〕To strike or assail repeatedly with or as if with blows or missiles; bombard:连续地投掷：用或似用拳头或投掷物反复地打击或攻击；轰击：〔attack〕The fleet anchored in the bay and bombarded the town) or figuratively with words ( 舰队在海湾抛锚并轰击了城镇） 或用言语象征性的攻击（ 〔cannon〕To bombard with cannon.炮轰：用炮来轰击〔zap〕To strike suddenly and forcefully as if with a projectile or weapon:轰击，打击：好象用投掷物或武器猛烈而有力地攻击：〔polonium〕A naturally radioactive metallic element, occurring in minute quantities as a product of radium disintegration and produced by bombarding bismuth or lead with neutrons. It has 27 isotopes ranging in mass number from 192 to 218, of which Po 210, with a half-life of 138.39 days, is the most readily available. Atomic number 84; melting point 254°C; boiling point 962°C; specific gravity 9.32; valence 2, 4. See table at element 钋：一种具有天然辐射性的金属元素，作为镭分裂的产物以极小量出现，可通过用中子轰击铋或铅获得。它从192到218的质量数中可排列为27种同位素，其中的钋210半衰期达138.39天，是最易得到的同位素。原子序数84；熔点254°C；沸点962°C；比重9.32；化合价2, 4 参见 element〔Franck〕German-born American physicist. He shared a 1925 Nobel Prize for discovering the laws that describe the impact of electrons upon atoms.夫兰克，詹姆斯：(1882-1964) 美裔德国物理学家，发现了描述电子轰击原子的法则从而获得了1925年诺贝尔奖〔bombard〕To irradiate (an atom).轰击：放射（原子） |
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