Icy roads are a hidden danger to motorists.

覆盖着冰的路面对驾驶汽车的人是个危险的隐患。

《新英汉大辞典》

There is an object relational mapper out there that is a hidden gem.

那里有一个对象关系映射程序，它是一块隐藏的宝石。

youdao

There are fears of a hidden agenda behind this new proposal.

人们担心这一新提议的背后有不可告人的目的。

《牛津词典》

The man telling his story in "Invisible Man" lives in a hidden underground space.

VOA: special.2010.09.19

Embedded within the explicit plot of the simile is a secret, a kind of buried narrative, and it's a hidden story that illustrates Satan's self-destruction.

深藏在这个比喻精巧的情节布局里的，是一个秘密，一个被深埋已久的故事，一个隐藏着的，阐述了撒旦自我毁灭的故事。

耶鲁公开课 - 弥尔顿课程节选

It's not as popular as Central Park. But I feel like it's kind of a hidden gem.

它并没有中央公园有名。但我觉得它是一枚被隐藏的瑰宝。

纽约的公园 - SpeakingMax英语口语达人

The popular Loft Suite was the VIP Room for the Cauldron Nightclub, accessible via a hidden stairway.

BBC: Mini guide to Sydney, Australia

In other words, who else might you meet in a hidden, ultra exotic, miles-high Himalayan kingdom?

FORBES: Connect

Money managers are experts with an advertised, as well as a hidden, informational advantage.

FORBES: Freakonomics: The Hidden Side of Managing Money ( September 2, 2005 )