| 单词 | 白色光 |
| 释义 | 〔mayweed〕A widespread weed(Anthemis cotula) having rank-smelling, bipinnately divided leaves and white-rayed flower heads. Also called stinking chamomile 臭甘菊：一种遍生的野草（臭甘菊 春黄菊属） 。有腐臭味、二回羽状分叶和发白色光的花冠 也作 stinking chamomile〔radium〕A rare, brilliant white, luminescent, highly radioactive metallic element found in very small amounts in uranium ores, having 13 isotopes with mass numbers between 213 and 230, of which radium 226 with a half-life of 1,622 years is the most common. It is used in cancer radiotherapy, as a neutron source for some research purposes, and as a constituent of luminescent paints. Atomic number 88; melting point 700°C; boiling point 1,737°C; valence 2. See table at element 镭：一种稀有的、有白色光泽、发光、高度放射性的金属元素，极少量地存在于沥青矿中，有13种同位素，质量数介于213和230之间，最常见的为镭226，半衰期为1,622年。镭可用于癌症的放射治疗，在其它一些研究中用作中子源，还可用作发光颜料的成分。原子序数88；熔点700°C；沸点1,737°C；原子价2 参见 element |
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