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- Isotope: One of two or more species of atoms of a chemical element having nuclei with the same number of protons But different numbers of neutrons. 同位素:一种化学元素的两个或多个类型,它们的原子核具有相同的质子数,而中子数却不同。
- For the first time ever, scientists have been able to create a chemical element that can fight caner cells. 科学家第一次能够创造出一种抗癌细胞的化学成分。
- Miller, M.S.,Friedlander and S.K.,Hidy, G.M.(1972),”A chemical element balance for the Pasadena aerosol”, Journal of Colloid and Interface Science.Vol.39,pp.165-176. 张凯伦,2004,”大气奈米微粒无机盐类组成特性研究”,硕士论文,国立成功大学环境工程研究所,台南。
- Radium is a chemical element. 镭是一种化学元素。
- In 1960 he reportedly sent Vasudev Iya,a young chemist,to France to absorb as much information as he possibly could about how polonium--a chemical element used to trigger a nuclear explosion--was prepared. 据说他在1960年曾派年轻的化学家瓦苏德瓦·伊亚前往法国,尽可能多地收集关于怎样准备钋(一种用于引发核爆炸的化学元素)的信息。
- We are doing a chemical experiment. 我们正在做化学实验。
- What Robert Boyle (1627-1691) gave in his Sceptical Chymist (1661) is not, as is commonly said, a modern definition of a chemical element, but a traditional definition of a chemical element. 波义耳在《怀疑派化学家》(1661年)一书中并没有象人们通常所说的那样给化学元素下了科学的定义,而是给出了当时人们所理解的传统元素定义。
- Ammonia is a chemical substance. 氨是种化学物质。
- In 1960 he reportedly sent Vasudev Iya, a young chemist, to France to absorb as much information as he possibly could about how polonium--a chemical element used to trigger a nuclear explosion--was prepared. 据说他在1960年曾派年轻的化学家瓦苏德瓦·伊亚前往法国,尽可能多地收集关于怎样准备钋(一种用于引发核爆炸的化学元素)的信息。
- A chemical derived from petroleum or natural gas. 石油化学制品从石油或天然气中提炼出的化学产品
- The two elements are synthesized by a chemical process. 这两种元素已经化学合成。
- A chemical compound consisting of such molecules. 二聚化合物这种聚合物形成化合物
- We must include this chemical element in the group. 我们必须使组里包括这种化学元素。
- The ability to take part in a chemical reaction. 活性,活度参加化学反应的性能
- A chemical factory blew up early in the morning. 有间化工厂凌晨发生爆炸。
- Content of Other Chemical Element Max. 化学元素含量,不大于。
- We saw that a chemical change had taken place. 我们看到已发生了化学变化。
- Hydrogen is the lightest chemical element of all. 氢是所有化学元素中最轻的。
- A chemical group is a submolecular group of atoms. 化学基因是亚分子的原子集团。
- A chemical constituent of cannabis, C21H28(OH)2. 大麻醇,大麻酚大麻的一种化学成分,C21H28(OH)2