classified

名词 classified:

1. a short ad in a newspaper or magazine (usually in small print) and appearing along with other ads of the same type
   同义词：classified ad, classified advertisement

动词 classify:

1. arrange or order by classes or categories
   同义词：classify, class, sort, assort, sort out, separate
2. declare unavailable, as for security reasons
   同义词：classify
3. assign to a class or kind
   同义词：relegate, classify

形容词 classified:

1. arranged into classes
2. official classification of information or documents; withheld from general circulation

1. A book containing an alphabetical or classified listing of names, addresses, and other data, such as telephone numbers, of specific persons, groups, or firms.
   通讯录，工商行名录，号码簿内含按字母顺序排列分类的人名、地址和其他资料的书，如特定的人、团体或公司的电话号码
2. The books in the library are classified by/according to subject.
   图书馆的书是按照[根据]科目分类的。
3. I'm looking for the classified section. Have you seen it?
   我正在找分类广告栏，你见到了吗？
4. The books in the library are classified by subject.
   图书馆的书是按科目分类的。

clas.si.fied

adj.Abbr. class.（形容词）缩写 class.
Arranged in classes or categories.
分门别类的：划分到阶级或类别中的
Available to authorized persons only, as for reasons of national security:
机密的，保密的：只提供给获得授权的人的，如因国家安全的原因：
例句：
a classified document.
机密文件