名词
中文翻译：秘密
同义词：
['hidden', 'confidential', 'privy']
例句：
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1. The secret of the puzzle is that it's a coded message.
这个谜题的秘密在于它是一个加密的信息。
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2. She kept her secret well and no one knew about it.
她保守得很好，没有人知道这件事。
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3. He was so secretive about his plans that no one could guess what he was up to.
他对计划守口如瓶，以至于没人能猜到他正在做什么。