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The phrase "dark area" is correct and usable in written English.
You can use it to describe a topic or area of knowledge that is either unknown or not well understood. For example: "Since there are so many unknowns, the subject of extraterrestrial life remains a dark area."
Exact(60)
All the channels in the light areas flow from one dark area to another dark area".
"They would look for a dark area where it's quiet," he said.
Except for the white, all Akitas bear a distinct mask (dark area around the muzzle).
"I felt in a really dark area, and I didn't know how to get out of it".
As Huygens descended, it drifted over a plateau, above, toward a landing in the dark area at right.
At Verbena, the bar has just five seats and is set into a dark area with a low ceiling.
Gradually, central vision may become blurred, or a completely dark area may appear in the center of the vision.
Hence, there is no real dark area in output image from these techniques.
The dark area in Figure 2b represents that DWS is active in that region.
(b) Solid line: E(m); dark area: active region of DWS m).
The images revealed that the WcBiM chip had a narrower dark area than the Au chip.
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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