名词
中文翻译：Unknown
同义词：
['cryptograph', 'cryptogram', 'codeword', 'secret', 'secretly', 'covert', 'clandestine']
例句：
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1. 暗号
密码
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1.The codeword was "B" for bomb.
这个密码是“B”代表炸弹。
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2.They were secretly meeting in the back room.
他们正在后室秘密会面。
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3.Covert operations are often necessary to achieve our goals.
隐蔽行动往往是我们实现目标的必要手段。