The phrase "recognized as difficult" is grammatically correct and can be used in written English.
It is typically used to describe a certain aspect or element of something that is widely acknowledged or perceived to be challenging or problematic. Example: The new mathematics curriculum was recognized as difficult by both students and teachers, leading to concerns about its effectiveness in the classroom.
Domestication is commonly recognized as difficult to define due to the variety of situations that cannot be neatly classified as wild or domestic.
Automated verification of control programs can be part of cost-effective methodologies to support certification, but it is widely recognized as difficult to attain in robotics, because of several traits that characterize robot design and implementation.
Differences within the host countries nursing practice have been recognized as difficult during and beyond transition for many IENs.
Parallel findings present in the literature and dietary change is recognized as difficult to achieve, particularly among low socio-economic and migrant groups [ 52, 53].
The Q-factor Schizoid includes the DSM-IV diagnosis of Schizotypal, Schizoid and Avoidant Personality Disorder, recognized as difficult to distinguish.
Look for classes that will be recognized as difficult, but preferably without overly difficult grading.
Basic violet 3 (BV3) dye and perchloroethylene (PCE) environmental hormone are recognized as difficult-to-treat pollutants and are discharged by a wide variety of sources.
Washington, which is still bogged down in Iraq, and France, the widely unpopular former colonial power, have been happy to see someone else assume responsibility for what is recognized as a difficult and thankless task.
This CSTR is widely recognized as a difficult problem for the purpose of control.
Context: Developing concurrent software has long been recognized as a difficult and error-prone task.
However, stainless steels are commonly recognized as materials difficult to machine because of their high toughness, high work hardening rate, and low thermal conductivity.
