"arranged in classes," 1828, past participle adjective from classify. Meaning "secret" (of government information) is from 1941, American English. Classifieds (n.) "newspaper advertisements arranged by classes," 1913, is short for classified advertisements
实用例句
1. She never participated in obtaining or copying any classified documents for anyone.
她从未参与过为任何人获取或复制机密文件之事。
来自柯林斯例句
2. At least one British officer was feeding him with classified information.
至少有一个英国官员在向他提供机密情报。
来自柯林斯例句
3. He has a security clearance that allows him access to classified information.
他获得了安全许可，可以接触机密信息。
来自柯林斯例句
4. The spy returned to deliver a second batch of classified documents.
那名间谍返回来递送第二批机密文件。
来自柯林斯例句
5. The coroner immediately classified his death as a suicide.