infiltrator
🇺🇸
/ˈɪnfɪltreɪtər/
🇬🇧
/ˈɪnfɪltreɪtə(r)/
Someone who sneaks into a group or place to gather information or to influence it.
The security guard caught an infiltrator trying to sneak into the company's database.
保安抓住了一个试图潜入公司数据库的渗透者。