undercover
英 [ʌndə'kʌvə; 'ʌndə-]
美['ʌndɚ'kʌvɚ]
- adj. 秘密的，秘密从事的；从事间谍活动的
考试真题
- Last year, the Transportation Security Administration ( ' , TSA) found in a secret check that undercover investigators were able to sneak weapons---both fake and real—past airport security nearly every time they tried.
出自-2017年考研阅读原文
- Last year, the Transportation Security Administration found in a secret check that undercover investigators were able to sneak weapons—both fake and real—past airport security nearly every time they tried.
2017年考研真题（英语一）阅读理解 Section Ⅱ