1. 化学元素：chemical contamination 化学污染 | chemical element 化学元素 | chemical emasculation 化学去雄
2. 化学成分：化学损伤:chemical damage | 化学成分:chemical element | 化学体系:chemical system
3. 化学元素,化学成分：broadband network宽带网 | chemical element化学元素,化学成分 | study law学法律; by law根据法律;
4. 元素：Biochemistry Category:生物化学 | Chemical Element 元素 | Chemical Engineering Category:化学工程
1. For example some marble produces niton, a harmful chemical element in the air.
2. Health officials say manganese is both a common chemical element and a required nutrient in drinking water.
3. Controlling chemical pollutants is increasingly important to industrial community as a crucial element of risk management.
4. Uranium is a radioactive and poisonous chemical element which can produce negative impacts on the human genetic system.
noun
1. any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
Synonym: element