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Discover LudwigThe phrase "are only simple" is grammatically correct and can be used in written English.
It can be used when describing something that is straightforward or uncomplicated, often in contrast to something more complex.
Example: "The solutions to these problems are only simple, requiring minimal effort to understand."
Alternatives: "are merely straightforward" or "are just basic."
Exact(3)
However, the XRD results suggest that two hydrated salts are only simple physical mixing.
Unlike most existing hybrid navigation systems whose deliberative layers usually play the dominant role while the reactive layers are only simple executors, a more independent reactive layer that can guarantee convergence without the assistance of a deliberative layer is pursued in the proposed architecture, which brings two benefits.
The stimuli involved in the task are only simple geometric square shapes, familiar to most all individuals.
Similar(57)
They were only simple MPs.
Previously, there were only simple proprietary systems, which were these proprietary black boxes.
(Note that these are only the simple concepts.
Note that these are only very simple declarations.
There are only a few more simple steps.
If it were only that simple.
If only it were only so simple, obesity experts say.
Ah, if the question were only that simple.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com