not harmed by something (for example, dangerous or dirty substances) 未被损害的;未受污染的 uncontaminated water 未被污染的水
The equipment is sterilized to ensure that the blood remains uncontaminated. 设备经过消毒,以确保血液不受污染。 The problems were made worse by the inadequate provision of medical help and uncontaminated milk. 医疗救助的不足和未受污染的牛奶使问题变得更加严重。