About
密 is a phono-semantic compound: the roof radical 宀 suggests an enclosed space, 必 provides the phonetic element, and the mountain radical 山 forms the base. Originally describing a hidden mountain retreat, its meaning expanded to denote density and thickness, naturally extending to concepts of secrecy and intimacy, as things kept closely packed or concealed.
Etymology Hide
Example Sentences Hide
我知道你的秘密。
密码必须保密。
他们关系很密切。
森林里树木茂密。
这座城市人口稠密。
政府文件是机密的。
我们需要严密监视。
加密技术保护数据安全。