1. secret: if something is secret ,
not many people know about it, and they agree not to tell anyone else about it
例：
The president's schedule is secret, but
there is speculation that he will visit UN troops in the area.（總統(tǒng)行程是保密的，但有人猜測(cè)他會(huì)去慰問駐扎在當(dāng)?shù)氐穆?lián)合國(guó)部隊(duì)。）
remain/stay secret
I hope you see how vital it is that our
conversation remains secret.（我們倆所說的要保密，我希望你明白這點(diǎn)有多重要。）
top secret (=when
an official document, piece of information etc. is very secret)
The experiments were top secret.（這些實(shí)驗(yàn)是高度機(jī)密。）
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2. confidential: confidential
information is known only by a few official people, and must not be told to
anyone else, for example because it contains military secrets or private
details about people例：
a confidential government report（政府機(jī)密報(bào)告）
Always protect confidential files by
locking them with a password.（機(jī)密文件一定要加密保管。）
highly/strictly confidential (=very confidential)
The information we received is of a highly
confidential nature and relates to national security.（我們收到的這個(gè)信息關(guān)系國(guó)家安全，要高度保密。）
The information will be regarded as
strictly confidential (= completely confidential ) .（這個(gè)信息一定要高度保密。）
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3. classified: classified
information or documents are ones that the government has ordered to be kept
secret
例：
There is evidence that Huang had access to
classified information.（有證據(jù)表明，黃某已經(jīng)得到了機(jī)密信息。）
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4. sensitive: information or
documents that are sensitive are likely to cause problems or embarrassment if
they are made public and therefore they are kept secret
例：
A teenager used his personal computer to
break into sensitive US Air Force files.（一個(gè)青少年用私人電腦破解了美國(guó)空軍的敏感文件。）
highly sensitive
The minister admitted that highly sensitive
documents had been leaked to the press.（這位部長(zhǎng)承認(rèn)說有人已將政府敏感文件透露給媒體。）
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5. covert: done secretly, especially
by a government or official organization, often involving breaking the law
例：
convert operations（秘密行動(dòng)）
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6. underground: an underground
organization or newspaper is one that operates or is produced secretly and
opposes the government
例：
Her father was a member of the underground
resistance movement in France during World War II.（二戰(zhàn)期間，她爸爸是法國(guó)地下抵抗運(yùn)動(dòng)的成員。）
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7. undercover: working secretly -
use this about the activities of the police, the army etc.
例：
Six members of a drug-smuggling gang were
arrested after an 18-month undercover police operation.（警方經(jīng)過18個(gè)月秘密偵查，抓獲了6名毒販。）
The unit is equipped to deal with a variety
of situations, including undercover surveillance.（這個(gè)公寓設(shè)施齊全，可以在很多情況下使用，包括進(jìn)行秘密監(jiān)視。）
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8. hush-hush: used about information
or activities that are kept officially secret
備注：''hush-hush''常用于非正式的場(chǎng)合。
例：
His death was really hush-hush. It was so
covered up that you wondered if it wasn't a suicide.（他的死訊高度保密，掩藏得這么好，倒讓人覺得這可能不是自殺。）
'The Manhattan Project' was the insiders'
name for the hush-hush project.（“曼哈頓計(jì)劃”是這個(gè)秘密計(jì)劃的內(nèi)部代號(hào)。）
He was put in charge of some hush-hush
military project.（他被任命負(fù)責(zé)一個(gè)秘密軍事項(xiàng)目。）
I've no idea what he does - it's all very
hush-hush.（我不了解他是做什么的，總搞得很神秘。）
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9. cloak-and-dagger: adj. use
this about methods and activities that involve a lot of secrecy, especially
when this seems unnecessary
備注：''cloak''原意是“斗篷”，''dagger''原意是“匕首”，''cloak-and-dagger''用于形容“跟間諜有關(guān)的”。
例：
He was arrested after a cloak-and-dagger
operation involving the CIA and MI6.（他因?yàn)樯婕伴g諜活動(dòng)竊取中央情報(bào)局和軍情六處的資料而被捕。）
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