名詞 secret:

1. something that should remain hidden from others (especially information that is not to be passed on)
2. information known only to a special group
   同義詞：arcanum
3. something that baffles understanding and cannot be explained
   同義詞：mystery, enigma, closed book

形容詞 secret:

1. not open or public; kept private or not revealed
2. conducted with or marked by hidden aims or methods
   同義詞：clandestine, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, surreptitious, undercover, underground
3. not openly made known
   同義詞：unavowed
4. communicated covertly
5. not expressed
   同義詞：private
6. designed to elude detection
   同義詞：hidden
7. hidden from general view or use
   同義詞：privy, secluded
8. (of information) given in confidence or in secret
   同義詞：confidential
9. indulging only covertly
10. having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding
    同義詞：mysterious, mystic, mystical, occult, orphic
11. the next to highest level of official classification for documents

1. Jill will find out your secret she never misses a trick!
   吉爾會(huì)發(fā)現(xiàn)你的秘密的－－她很警覺！
2. His secret died with him, for he never told anyone.
   他的秘密至死也不為人知，因?yàn)樗麖奈锤嬖V過別人。
3. All the people who know this secret represent a security risk.
   凡是知道這個(gè)秘密的人都對安全造成危險(xiǎn)。
4. Is your brother in the secret?
   你弟弟知道這個(gè)秘密嗎？
5. Our plan must remain a secret.
   我們的計(jì)劃必須保密。
6. What's the secret of baking perfect bread?
   烤出好面包的秘訣是什么？
7. We discovered a secret passage behind the wall.
   我們在墻后發(fā)現(xiàn)了秘密通道。