点击下方单词,选择对的这个单词
点击下面链接下载与本句相关的学习资源，包括PDF教材和音频练习，方便课后复习：
形容词
1. (信息或文件)机密的，保密的Classified information or documents are officially secret.
1. a short ad in a newspaper or magazine (usually in small print) and appearing along with other ads of the same type
Synonym: classified adclassified advertisement
多通过句子记忆单词，而不是单独死记硬背。
