base metal
Longman Dictionary of Contemporary English 5++LDOCE 5++ˌbase ˈmetal noun [countable, uncountable] HCMa metal that is not very valuable, such as iron or lead 贱金属，普通金属〔如铁、铅等〕
Examples from the Corpus
base metal• Gilded Finish Gilding is a process of overlaying a base metal with a very thin layer of gold.• Gold mineralisation is associated with earlier fluids; antimony and base metal sulphides with later fluids.• The area has potential for the discovery of base metal sulphides.• The transmutation of base metal to gold was the paradigm of this sacred task.• Mineralisation within the nodules consists of uranium, vanadium and iron oxides with base metal sulphides.ˌbase ˈmetal nounChineseSyllable
very a not valuable, such that Corpus is metal
base metal
ˌbase ˈmetal
noun [uncountable and countable]
a metal that is not very valuable, such as iron or lead
ˌbase ˈmetal
noun [uncountable and countable]a metal that is not very valuable, such as iron or lead