noun🔗Share镧 A chemical element (symbol La) with an atomic number of 57: a soft, ductile, silvery-white metal that tarnishes slowly when exposed to air."The chemistry student learned that lanthanum is a silvery metal used in some camera lenses. "化学系的那个学生了解到，镧是一种银白色的金属，被用于某些照相机镜头中。elementsubstancematerialchemistryscienceChat with AIVocabulary GamePractice Reading
noun🔗Share镧原子 An atom of this element."The chemistry student pointed to lanthanum on the periodic table and said, "An atom of lanthanum has 57 protons." "化学专业的学生指着元素周期表上的镧说：“一个镧原子有57个质子。”elementchemistrysubstancematerialscienceChat with AIVocabulary GamePractice Reading
