The rest of the medical staff knew about my existence in the clinic, but they were bound by a non disclosure agreement.

其他医护人员知道我在诊所的存在 但他们有一个保密协议。

After he accepted and arrived in Kenya, Sama asked him to sign a non disclosure agreement (NDA), only then revealing to him the type of content he would be working with daily.

在他接受并抵达肯尼亚后，Sama要求他签署一份保密协议(NDA)，然后才向他透露他每天工作的内容类型。