impurityn.不纯;杂质
impurity dopant杂质
impurity levels[电] 杂质能阶
impurity anions杂质离子
impurity defect杂质缺陷
impurity source杂质源
impurity bubble杂质泡
impurity centre杂质中心
impurity forming结杂
impurity cluster杂质团
impurity profile杂质分布图