Any of several hard,strong alloys of iron,aluminum,nickel,cobalt and sometimes copper,niobium,or tantalum,used to make strong permanent magnets.是什么意思_Any of several hard,strong alloys of iron,aluminum,nickel,cobalt and sometimes copper,niobium,or tantalum,used to make strong permanent magnets.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句