As a secret training base for a revolutionary new plane, it was an excellent site, its remoteness effectively masking its activity.

作为新型飞机的秘密训练基地，这是一个非常理想的地方；因为它地处边陲，人们不容易了解其中的活动。

youdao

Soldiers have been training at a secret location.

士兵们一直在一个秘密的地方训练。

《柯林斯英汉双解大词典》

Well let me fill you in on a little secret - with a little effort and some training, you can get your entryway cleaned up and organized in no time. This, however, is not what you want it to look like.

好吧，就让我悄悄告诉你一个小秘密——只需要一点点的精力和训练，你就能让你家的入口立即变得整洁干净起来。

youdao

Any secret training methods that the Jamaicans use better than anyone else?

NPR: Jamaicans Revel In 100M Olympic Triumphs

"We try best-case scenarios and also try worst-case scenarios so our staff will know how to react, " said Secret Service Special Agent Renee Triplett, who oversees Secret Service training.

CNN: Pope Benedict XVI begins first U.S. tour

Washington (CNN) -- The media spotlight has focused on the brash couple who recently managed to attend a White House state dinner, but a U.S. Secret Service training document details 91 breaches of security between 1980 and 2003.

CNN: Secret Service report details 91 breaches