n. 秘密, 机密, 秘诀, 秘方
a. 秘密的, 极机密的, 隐蔽的, 暗中的, 神秘的, 偏僻的
英文释义
n. something that should remain hidden from others (especially information that is not to be passed on)
n. information known only to a special group
s. not open or public; kept private or not revealed
s. communicated covertly