Holbrooke's location in Pakistan personally coming here is a closely guarded secret, given the heightened security concerns following deadly terrorist attacks in Lahore and Peshawar,last week.

VOA: standard.2009.06.03

What we don't get here is a sense of whether there really is an alternate secret postal system that serves a sort of underground of private networks.

在这里我们所不明白的是，是否真的存在一个,提供地下的,私密的通信服务的，秘密邮政系统。

耶鲁公开课 - 1945年后的美国小说课程节选

- Here, the secret is not a number 13, it's actually the build -- the diagram, the details, the gears, and the handles inside of this physical machine that constituted a secret.

这里，机密数字不是数字13，它实际上构造了-,一个图表，这个物理装置中的细节，传动装置，操纵,就构建成了一个机密。

哈佛公开课 - 计算机科学课程节选