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The phrase "are known close" is not correct in English and does not convey a clear meaning.
It seems to be an attempt to express familiarity or proximity, but it lacks proper grammatical structure.
Example: "The two friends are known to be close."
Alternatives: "are recognized as close" or "are regarded as close."
Similar(60)
Two crystalline forms of the element are known: close-packed hexagonal below about 230 °C (450 °F) and body-centred cubic above.
For some types of phylogenetic tree, there are known closed form solutions to this problem.
D/R, as it was known, closed in 1978, but many people, including me, never got over it.
But nothing really changed after that, and in August 1998, Old Main, the name by which the institution had come to be known, closed in disrepair.
The three are known to be close to Karimova.
The two younger men are known to be close, said Mr. AbuKhalil and Mr. Henderson.
Both men are known to be close to the Chinese government.
All of the above are known to be close to key Conservative politicians, right up to David Cameron.
Fortunately, in the massive MIMO regime, the performance of such filters are known to be close to the optimal schemes.
Side chains from residues at these positions are known to form close contacts with H2-Db.
Princeton's a cappella singing groups are known for being close-knit.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com