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Discover LudwigThe phrase "a black box" is correct and usable in written English.
This phrase is commonly used to refer to items that are unknown or mysterious, such as a person's mysterious behavior, or an unexplained electronic device. For example, "He refuses to explain his actions, like a black box".
Exact(55)
Also a black box.
"It opens a black box.
Google is a black box.
It was a black box.
They are a black box.
The brain is a black box.
Similar(5)
But don't call the new stage a black-box theater.
"Pre- and post-assessment is a black-box.
Regulators call it a "black-box" system.
Therefore, the process becomes a 'black box' to patients.
DWP has a 'black box' approach to Work Programme delivery.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com