词根助记
adj.相密的 例句
He destroyed the confidential document as soon as he had finished reading it.
他一读完机密文件就把它销毁了。
They are seldom used for sharing confidential data.
它们很少用于共享机密数据。

词组搭配
confidential data
机密数据
confidential information
机密信息；机密情报
confidential documents