admixture
noun [ C usually singular ] chemistry specialized uk/ədˈmɪks.tʃər/ us/ədˈmɪks.tʃɚ/
混合物;附加剂
something that is added to something else
Platinum combines with phosphorus and arsenic and is seldom found without an admixture of related metals. 铂见于含磷、砷的铂化合物中，并且绝大多数情况下都和一些铂族金属共生。