钪、钇和镧系元素合称稀土元素,本世纪60年代以来,稀土的开发与应用取得了长足进展,遍及国民经济各个领域,关系到高技术、新材料的开发。 Scandium, yttrium and lanthanides are collectively called rare earth elements. Since the 1960s, great progress has been made in the development and application of rare earths, covering all areas of the national economy and related to the development of high-tech and new materials.