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Discover LudwigSuggestions(5)
"been a challenging issue" is correct and can be used in written English.
You can use it to describe a problem that has been difficult to solve or overcome. For example: "Climate change has been a challenging issue for governments around the world for many years."
Exact(23)
The corrosion of the concrete in the brine environment has been a challenging issue over years.
In this regard, determining the spatial distribution of fractures has been a challenging issue.
Accommodating free edges has been a challenging issue in the DSC analysis of beams, plates, and shells.
Separation of ethylene from the effluent gas of oxidative coupling has been a challenging issue for several years.
Understanding the tip contribution has been a challenging issue for a reliable analysis of the sample properties.
Rapid and convenient removal of organic dyes from wastewater has been a challenging issue faced by scientists [1 6].
Similar(37)
"Agriculture tends to be a challenging issue," he said.
Tracing these decisions is a challenging issue.
This topic will be a challenging issue for future research.
Defect suppression is a challenging issue in the SLM process.
Clustering is a challenging issue that is heavily shaped by data used and problems considered.
More suggestions(15)
been a tricky issue
been a complex issue
been a tough issue
been a challenging problem
been a significant issue
been a delicate issue
been a contentious issue
been a controversial issue
been a challenging month
been a vexing issue
been a challenging task
been a challenging part
been a particular issue
been a challenging period
been a divisive issue
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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