Everyone involved was sworn to secrecy.

所有相关人员均宣誓保密。

《牛津词典》

The secrecy of the mentioned research enables the companies involved to tell us anything they like.

上述的这些研究的秘密性任由这些公司想告诉我们就讲什么情况。

youdao

Tehran denies there was any secrecy involved, and that the plant hadn't reached the point where the government needed to disclose its existence.

德黑兰否认有任何秘密意图，该设施还未到支付需要披露其存在的时候。

youdao

Led by the conclave's senior cardinal, Giovanni Battista Re, each of the cardinal-electors -- those under age 80 who are eligible to vote -- then swore an oath of secrecy, and all those not involved were ordered to leave.

CNN: March 13, 2013 -- Updated 1133 GMT (1933 HKT)