The word is 'undercover', meaning secret or engaged in secret activities, often used to describe espionage.
这个单词是 'undercover'，意思是秘密的或从事秘密活动的，常用于形容间谍活动。
| 单词 | undercover |
|---|---|
| 发音 | [ʌndə'kʌvə; 'ʌndə-] |
| 释义 | adj. 秘密的，秘密从事的；从事间谍活动的 |
| 词序 | 7668 |
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