(noun.) a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition.
录入:默多克
双语例句
In these were found large quantities of iron, considerable percentages of nickel, as well as cobalt, copper, silicon, phosphorus, c arbon, magnesium, zinc, and manganese. 李贝.西洋科学史.