The phrase "a challenge to study" is correct and usable in written English.
It can be used when discussing the difficulty or complexity of a particular subject or topic that requires significant effort to understand or learn.
Example: "The advanced mathematics course presented a challenge to study, but I was determined to succeed."
Alternatives: "a difficulty in studying" or "a struggle to learn".
Far flying and too small to tag with GPS receivers, songbirds are a challenge to study in the wild.
It's a challenge to study the cognitive abilities of any creature that lacks language, but human babies present an additional difficulty, because, even compared to rats or birds, they are behaviorally limited: they can't run mazes or peck at levers.
However, it has been a challenge to study its oxygen reduction and evolution reactions in conventional aqueous systems as the instability of Cu2O in aqueous solution, especially in acid or alkaline solution.
One, it was an opportunity and a challenge to study American poetry and, two, the syllabus of the seminar proposed an investigation of the diversity of recent American poetry.
"It's a challenge to study the genetics and genomics of birds," Edwards says, "because you can't grow them in a lab like you can a fruit fly".
It is a challenge to study anomaly cases for satellites in the LEO environment because they were the most numerous among active satellites in 2015, with a total of 696 (53.33%), whereas satellites in GEO numbered about 481 (36.86%; UCS 2015).
A challenge to studying human tissue is that it is not possible to examine the temporal or dynamic expression that might be occurring throughout the initiation, development, and maintenance of the AVM.
Family-based studies have the ability to control for some confounding factors and factors that could create selection bias that pose a challenge to studies of unrelated individuals.
A major challenge to study PKSs arises from their flexible nature.
It's a daunting challenge to study animals that migrate over great distances across multiple political boundaries.
It is thus a great challenge to study and quantify the heterogeneity in the uptake of label free-NPs which has never been done so far.
