| 单词 | 核反应 |
| 释义 | 〔neptunium〕A silvery, metallic, naturally radioactive element, atomic number 93, the first of the transuranium elements. Its longest-lived isotope is Np-237 with a half-life of 2.1 million years. Found in trace quantities in uranium ores, it is produced synthetically by nuclear reactions. See table at element 镎：一种银白色的、金属性天然放射性元素，原子序数为93，第一个超铀元素。其周期最长的同位素为Np-237，半衰期为210万年。见于铀矿的示踪量中，由核反应合成生产出来 参见 element〔star〕A self-luminous celestial body consisting of a mass of gas held together by its own gravity in which the energy generated by nuclear reactions in the interior is balanced by the outflow of energy to the surface, and the inward-directed gravitational forces are balanced by the outward-directed gas and radiation pressures.星，天体：本身能发光的天体，由自身吸力吸引的大量气体组成内部核反应产生的能量流向表面，向内的引力通过逃逸的气体和放射压力相抵消来达到平衡〔spallation〕A nuclear reaction in which many particles are ejected from an atomic nucleus by incident particles of sufficiently high energy.裂变：带有充足的高能量的外来粒子将许多粒子从原子核中排斥出的核反应〔lattice〕The spatial arrangement of fissionable and nonfissionable materials in a nuclear reactor.栅格：在核反应中可裂变和不可裂变的物质的空间排列〔radioactivity〕Spontaneous emission of radiation, either directly from unstable atomic nuclei or as a consequence of a nuclear reaction.自动放射：自动地发出辐射，直接源于不稳定的原子核或是作为核反应的结果〔photonuclear〕Of or relating to a nuclear reaction induced by photons.光核的，光致核反应的：由光子引起的核反应；与之有关的〔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 |
| 随便看 |
|
英汉汉英双解词典收录301015条英汉双解翻译词条，可根据汉字查询相应的英文词汇，基本涵盖了全部常用汉字的英文读音、翻译及用法，是英语学习及翻译工作的有利工具。