The building was turned into a secret military installation.

该楼被改建成一个秘密军事设施处。

《柯林斯英汉双解大词典》

The magician took the boy into a secret room.

魔术师把男孩带进了一间密室。

youdao

Turn your surprise into a secret.

把你的意想不到放进秘密里面。

youdao

"I know where there is a secret entrance into Rappaccini's garden."

VOA: special.2009.05.23

The U.N.investigators who are launching a probe into secret places of detention agree with Mohamed.

VOA: standard.2009.03.21

Seventy-nine Navy SEALs drop from the sky into a secret compound, designed for defense and manned by Al Qaeda killers.

FORBES: Connect

But most will probably slip back into a secret abode, unable to take a legal job, ineligible for welfare, tempted by crime and fearing arrest.

ECONOMIST: Please go quietly

What began as corruption in the post office, burgeoned into a secret fundraising scheme that included payoffs to members of Congress in return for their vote.

NPR: Corruption Claims Cloud Brazil's Presidential Election