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The phrase "are usually complex" is correct and usable in written English.
It can be used to describe something that typically has a complicated nature or structure.
Example: "The problems we face in modern society are usually complex, requiring multifaceted solutions."
Alternatives: "tend to be intricate" or "are often complicated".
Exact(53)
The chemical reactions are usually complex and involve hydration, oxidation, and carbonation.
Plant odours are usually complex mixtures, but often they are characterized by particular chemicals.
Their configurations and joints are usually complex and require a high level of craftsmanship to assemble.
The method, domain, and range, when applied to an R&D task, are usually complex.
Competent microbial cultures are required to handle waste materials efficiently, which are usually complex in nature.
Suitable microbial cultures are required to handle waste materials efficiently, which are usually complex in nature.
Similar(7)
One reason is that the communication signals are usually complex-valued such as the quadrature-amplitude modulation (QAM) signal, and minimum-shift keying (MSK) signal.
The deformation is usually complex and relies on several interdependent rhelogical and morphological parameters.
Communication design is usually complex in Multi-Agent Systems (MAS) because of dynamic emergent behaviours.
HSMR is used because it provides a simple, headline-grabbing way of conveying what is usually complex failure inside a hospital.
While asthma deaths were usually complex, "the introduction of any new treatment would be likely to reduce asthma deaths but I can't say by how much," Brightling said.
More suggestions(19)
are often complex
are typically complex
are usually diverse
are usually cumbersome
are usually difficult
are usually tricky
are usually problematic
are commonly complex
are usually intractable
are usually convoluted
are usually compound
are usually challenging
are usually empty
are usually blue
are usually mild
are usually alcoholic
are usually safe
are usually large
are usually right
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com