名词
中文翻译：秘密行动
同义词：
['secretive', 'clandestine']
例句：
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1. The thief was caught by the police in a daring heist.
这个小偷在一次大胆的抢劫中被警方抓获。
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2. They kept their plans secret from everyone else.
他们把计划保密，不让其他人知道。
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3. The couple had been keeping a secret from each other for years.
这对夫妇多年来一直瞒着对方。