更多意思
n.1.  秘密
2.  诀窍
3.  奥秘
adj.1.  秘密的,保密的,外人不得而知的
2.  (指行为与习惯)暗中进行的,未公开的,隐秘的
3.  (人或行为)诡秘,神秘
参考例句
1. | She said she was sorry, but her eyes betrayed her secret delight. |
| 她说她很难过,但从她的眼神里却流露出她内心的喜悦。
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2. | Can I entrust you with the secret plans? |
| 我能把这些秘密计划委託给你吗?
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3. | The top secret file was marked `For the President's eyes only'. |
| 在绝密档案上标有‘只供总统亲阅’字样。
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4. | You can rely on me to keep your secret . |
| 你尽管相信我一定为你保密。
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5. | All the people who know this secret represent a security risk. |
| 凡是知道这个秘密的人都对安全造成危险。
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常用词组
in secret   秘密地, 私下地
keep a secret   保守秘密