violent or severe weather (viewed as caused by the action of the four elements)
elements of cost
[经] 成本要素
elements of crime
[法] 犯罪要素
elements of halogen family
[化] 卤族元素
elements of the boron group
[化] 硼族元素
elements of the carbon group
[化] 碳族元素
elements of the nitrogen group
[化] 氮族元素
elements of winding
[电] 绕组元件