1. 名詞
   祕密, 機密
   內情
   /以上複數為"secrets"/
   限定單數the secret:
   祕訣
   訣竅
   祕方
   限定單數the secret of ...(事物) :
   ...的祕訣
   ...的訣竅
   

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   同義字詞
   confidence
   conundrum,enigma,head-scratcher,mystery,mystification,puzzle,puzzlement,riddle
   gateway,key,open sesame,passport,ticket
   

2. 形容詞
   秘密的, 機密的
   神祕的, 奧祕的
   私下的, 暗地裡的
   隱秘的, 隱蔽的
   暗藏的
   偏僻的, 幽靜的
   人跡罕至的
   能保守祕密的
   /以上必接名詞/
   (人)secret about ...(人事物) :
   

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   同義字詞
   backstairs,behind-the-scenes,clandestine,covert,furtive,hugger-mugger,hush-hush,private,privy,sneak,sneaking,sneaky,stealth,stealthy,surreptitious,undercover,underground,underhand,underhanded
   undercover
   cloistered,covert,hidden,isolated,quiet,remote,retired,secluded,sheltered
   behind-the-scenes,confidential,esoteric,hush-hush,hushed,inside,intimate,nonpublic,private,privy
   

3. 副詞
   in secret:
   秘密地
   私下地
   暗地裡
   在內心裡
   

4. 動詞片語連結
   act in secret:
   秘密行事
   秘密行動
   秘密做事
   

5. 語法
   It's no secret:
   這不是秘密
   誰都知道
   It's no secret for ...(人):
   這對...來說不是秘密
   It's no secret ...(完整句)/
   It's no secret that ...(完整句):
   ...已經不是什麼秘密了
   ...已經不是秘密了
   眾所周知，...
   

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例句

1. A women's secret (Women with gun).
2. Why should you have secret meetings?
3. Percy keeps his famous dad a secret .
4. The prime numbers must be kept secret .
5. Wherever you go, that secret goes with you.
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