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- When the organism dies, no new radioactive carbon is assimilated. 机体死后,不能再吸取新的放射性碳。
- They can determine the age of these bodies or artifacts by measuring the amount of radioactive carbon in them. 放射形碳元素确定年代技术。
- A living organism would take in the radioactive carbon and convert it to organic material. 有生命的有机体一定会吸收具有放射的碳,并把它转化为有机物质。
- The technique is so sensitive that it can detect a single radioactive carbon atom hiding among a quadrillion (one million billion) ordinary ones. 这项技术非常敏感,甚至能够在十的十五次方(一千万亿)个普通碳原子中找到一个放射性碳原子。
- A naturally radioactive carbon isotope with atomic mass 4 and half-life 5,780 years, used in determining the age of ancient organic, geologic, or archaeological specimens. 碳4:一种碳的天然放射性同位素,原子量为4,半衰期为5,780年,用于测定古代生物标本,地质标本或考古遗迹的标本的年代
- Calvin, Melvin (1911-97) American biochemist noted for his investigations of the DARK REACTIONS of photosynthesis (using radioactive carbon). He was awarded the 1951 Nobel Prize for Chemistry. 卡尔文:美国生物化学家,他使用放射性的碳原子发现了在光合作用中的暗反应。1951年他被授予诺贝尔化学奖。
- A radioactive isotope of carbon, especially carbon 14. 放射性碳碳的一种放射性同位素,尤指碳14。
- Radioactive ray is material thing. 放射线是实际的物质。
- Radium and uranium are radioactive elements. 镭和铀是放射性元素。
- A certain discharge of possible radioactive effluent. 一定量的可能有放射性的废水。
- I make a carbon copy of my documents. 我用复写纸复写文件。
- Soft drinks contain carbon dioxide. 软饮料中含有二氧化碳。
- I have some carbon paper somewhere or other. 我记得我在什么地方放有复写纸。
- She's a carbon copy of her sister. 她跟她姐姐一模一样。
- A naturally occurring or artificially produced radioactive element. 放射性元素自然产生或人为制造的放射性元素
- A radioactive compound used in radiotherapy or diagnosis. 放射性药剂一种用于放射性治疗或诊断的放射性化合物
- A copy made by using carbon paper. 复写本,副本用复写纸复印的一份
- The immediate product of the radioactive decay of an element. 继承元素某种元素放射性衰变的直接产物
- Isotopes that emit radioactive particles; a stove emitting heat. 发射出放射性粒子的同位素; 发出热量的炉子
- Plants can absorb carbon dioxide and release oxygen. 植物可以吸收二氧化碳释放氧气。