Some customers report difficulty learning how to fold and unfold the stroller, but were pleased with the stroller once they learned how to do it seamlessly. (parenthood.guide)
A particular problem for students with poor comprehension is that they have difficulty learning new vocabulary because they are inclined to read less, and are unable to apply new meanings to unfamiliar words. (cambridge.org)
He says that new approaches are desperately needed to help the roughly 20 % of children who have significant difficulties learning mathematics. (scientificamerican.com)