During the talk among the comrades, nothing should be concealed.

同志间的交谈应该是开诚相见。

《新英汉大辞典》

Even worse, they don't learn from their mistakes, because if, God forbid, one occurs, it should be concealed like a nasty secret.

更糟糕的是，他们不从错误中吸取教训。 这是因为如果——上帝保佑——一个错误发生了，应该像隐瞒一个肮脏的秘密一样把它深深埋在心底。

youdao

In addition, that unless they have a decorative theme, lighting elements and fixtures should be concealed from direct view whenever possible.

此外，除非他们有装饰的主题，内容和照明装置应当回避尽可能直接查看。

youdao

Most of the time, the master says, irezumi should be concealed.

ECONOMIST: Tattoos in Japan

Quinn, a Chicago Democrat who favors strict gun control including an assault weapons ban, said violence has been an "epidemic" in parts of the state and Illinois should be the nation's leader in keeping the concealed carry ban in place.

NPR: Ill. Gov. Wants Appeal Of Concealed Carry Ruling

That proposition can be stated as a question: In an America where at least 43 states now let a law-abiding citizen carry a concealed weapon, how should we protect ourselves in the fewer and fewer places where we are required to be unarmed?

WSJ: Jenkins: Gun Control That Works