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The phrase "are mainly complex" is correct and usable in written English.
It can be used to describe something that is primarily characterized by complexity, often in discussions about systems, ideas, or structures.
Example: "The problems we face in this project are mainly complex, requiring innovative solutions and collaborative efforts."
Alternatives: "are primarily intricate" or "tend to be complicated".
Exact(2)
Diet residues entering the colon are mainly complex carbohydrates (fiber), along with protein residues and primary bile acids secreted by the liver in response to fat intake.
Patients admitted in the ward are mainly complex surgical cases.
Similar(58)
For studies involving specific conditions or procedures these were mainly complex conditions such as hypoplastic left heart syndrome, transposition of great arteries and pulmonary atresia or procedures including Norwood Procedure, arterial switch operation and Blalock Taussig Shunt Procedure.
Paraoxonase 1 (PON1) is mainly complexed to HDL and is responsible, at least in part, for their antioxidant properties.
The multimers composed of the β subunits are mainly transmembrane complexes, whereas those composed only of meprinα are secreted, due to an intracellular processing event that removes the transmembrane anchor [4] [6].
Agro-residues are mainly comprised of complex polysaccharides that might serve as nutrients for microbial growth and production of enzymes.
Existing bone scaffolds are mainly characterized by complex porous designs whose shortcomings are a low level of permeability for growing tissue, and a difficult design customization.
These problems are mainly caused by complex pore structure of carbonate rocks and presence of various types of pore in them.
They are mainly comprised of a complex network of triangles made out of slender members.
The 29 buildings in this complex are mainly hospitals where new immigrants were sent to give birth, to be treated for curable illness or to die of illnesses that had no cure.
However, pre-Neogene granitoids and an accretionary complex are mainly exposed at the Echigo-Iide Mountains (Fig. 2).
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com