"demonstrated difficulty" is a correct and usable phrase in written English.
You could use this phrase to indicate that something has proven to be challenging. For example, "The student demonstrated difficulty understanding the concepts."
Accepting a shorter gain rather than a big loss or turnover is something Wilson has demonstrated difficulty learning at this stage of his career.
As can be seen in Table 5, the present study's students demonstrated difficulty with this particular CINS concept.
Data obtained from subjects who demonstrated difficulty understanding the study's core concept was discarded.
In addition to detecting correct ideas, each assessment also captured information about the proportion of students who demonstrated difficulty with five experimental knowledge areas.
These species are drought and heat tolerant, but they have demonstrated difficulty establishing with limited irrigation under extreme drought and high-temperature conditions.
A fall-risk assessment is not considered necessary for people reporting only a single fall, if there are no reported or demonstrated difficulty or unsteadiness [ 21].
However, the PTs demonstrated difficulties in using this intended representational sequence.
Other studies have demonstrated difficulties in differentiating a recurrent tumor from postoperative changes within 6 months after surgery [ 32] and within 12 months after radiation therapy [ 33].
Data are reported for three participants who were selected to participate based on demonstrated difficulties with oral control for thin liquids on their videofluoroscopic swallowing studies (VFSS).
Studies have demonstrated difficulties to satisfy contraceptive needs in communities where contraceptives are believed to be only for married people [ 33].
17 However, empirical research has demonstrated difficulties in disentangling HIA and HPP and what else is required for these to be influential in the policy arena.
