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The phrase "are difficult to visualize" is correct and usable in written English.
You can use it when discussing concepts, ideas, or data that are hard to picture or understand mentally.
Example: "The mathematical theories presented in the lecture are difficult to visualize without proper diagrams."
Alternatives: "are hard to picture" or "are challenging to imagine".
Exact(31)
Some articles are difficult to visualize without some type of visual aid, but don't add images that are irrelevant just to have them there.
Large numbers are difficult to visualize.
However, ex situ reconstructions such as models and movies are difficult to visualize in the context of the archaeological remains.
The dark gray coloured impressions are difficult to visualize if the background surface itself is dark or patterned.
Cerebral development involves a complex cascade of events which are difficult to visualize and quantify in vivo.
Pelagic ecosystem protection is usually incidental because these ecosystems are often data-poor and are difficult to visualize in a planning context.
Similar(29)
A higher nThIs (>0.70) is a strong indicator of tumour burden (Fig. 6), although it may be difficult to visualize the tumours even with the developed visualization tool.
It is difficult to visualize Toscanini in a scene like the one that unfolded at the Elbphilharmonie.
While this is difficult to visualize, there is an analogy that provides some insight although it is only a guide, not a definitive statement of the theory.
Memory is difficult to visualize, but Kunishi's images — comprised of portraits of both Sandinistas and Contras, artifacts relevant to their war, and stunning landscapes that hide the scars of battle — begin to tell the story.
Fibular malrotation is difficult to visualize on plain radiographs.
More suggestions(19)
are difficult to display
are difficult to picture
are difficult to devise
are difficult to conceive
are difficult to imagine
are difficult to view
are difficult to watch
are difficult to see
are difficult to consider
are difficult to contemplate
are difficult to envision
are difficult to disentangle
are difficult to control
are difficult to prevent
are difficult to target
are difficult to develop
are difficult to analyze
are difficult to obtain
are difficult to discern
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com