infiltration
noun [ U ] uk/ˌɪn.fɪlˈtreɪ.ʃən/ us/ˌɪn.fɪlˈtreɪ.ʃən/
卧底，渗透（进入某组织进行调查或施加影响）
the process of secretly becoming part of a group in order to get information or to influence the way that a group thinks or behaves
Police infiltration of Greenpeace sparked the scandal. 警方在绿色和平中卧底，引发了一场丑闻。
渗透（进入某物质、地方、系统或机构）
the process of moving slowly into a substance, place, system, or organization
It is important to manage moisture infiltration into buildings. 控制潮湿侵入建筑很重要。
medical specialized浸润（一些正常状态下没有的，或超过正常量的成分在组织或细胞中蓄积）
the process in which substances build up in tissue or cells where they are not normally found or where they are normally found in much lower amounts
Neuropathic pain is caused by infiltration of nervous tissue by cancer cells. 神经性疼痛是由癌细胞浸润神经组织造成。
See: infiltrate