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Discover LudwigSuggestions(5)
The phrase "are two main limitations" is correct and usable in written English.
It can be used when discussing specific constraints or drawbacks in a particular context, such as research, projects, or theories.
Example: "In this study, we identified that there are two main limitations that affect the validity of our results."
Alternatives: "there are two primary constraints" or "two significant drawbacks exist".
Exact(22)
There are two main limitations to this study: the use of SU in the control group, which limited the ability to separate the protective effect of insulin therapy on β-cell function, from the possible negative effect of SU.
But there are two main limitations to this move to greater genericism.
There are two main limitations of that work.
There are two main limitations to the tests considered so far.
There are two main limitations of this study that we would like to highlight.
While this research study has achieved its aims and identified key factors that influence individuals' susceptibility to phishing attacks, there are two main limitations to be noted.
Similar(38)
There are three main limitations to this study: first, its retrospective nature; second, the limited number of patients, which could result in a type II error; and, third, the fact that we analyzed clinically detectable advanced HCCs and not early HCCs in which the angiogenic dynamics might be different.
There are three main limitations explaining this.
There are three main limitations in our study.
There are three main limitations to this study.
There are three main limitations of this research.
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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