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Discover LudwigThe phrase "are extremely complex" is correct and usable in written English.
You can use it to describe something that has a high level of intricacy or difficulty, often in academic or technical contexts.
Example: "The algorithms used in machine learning are extremely complex, requiring a deep understanding of mathematics and statistics."
Alternatives: "are highly intricate" or "are very complicated."
Exact(60)
These songs are extremely complex.
"Investigations of this nature are extremely complex.
Our relations with America are extremely complex".
The new recommendations are extremely complex.
The giant NPC structures are extremely complex.
Not only that, many of these instruments are extremely complex.
Modern technological, biological, and socioeconomic systems are extremely complex.
Many of the cases are extremely complex, and increasingly so as medical practice advances.
The problems encountered in excavation and interpretation of what has been discovered are extremely complex.
The Franco-Chinese film production procedures signed in 2010 are extremely complex.
The processes, however, are extremely complex, involving not only combustion chemistry but also turbulent fluid mechanics.
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