"critical subjects" is a grammatically correct and usable phrase in written English.
It could be used to refer to topics or courses in school or university that are challenging or important. For example, "This semester I'm taking two critical subjects - an advanced mathematics course and a literature class."
Detectives were tight-lipped about critical subjects, including the possible motive for the attacks.
Within this collaborative human robot interaction paradigm, safety is one of most critical subjects.
These cities become critical subjects, not as a process of accelerated urbanisation, but examples of a radically different way of being in the city.
Turbulent flow over a porous medium has been one of the most critical subjects in numerous environmental and engineering studies.
Harvard Divinity School's dedicated centers and programs advance critical subjects in religious literacy, international study, women and religion, and other areas.
Last week saw calls in the UK to reduce the bills for students of science and maths in order to produce a larger contingent of qualified graduates, particularly to teach these critical subjects in schools.
But economic growth is a critical subject for anyone who worries about the environment.
'Housing' is a basic human necessity and has always been a critical subject of discussion around the world.
Chekhov, with his reputation for plainness and candor, is an ideal critical subject for her precisely because he seems, at first glance, not to be.
But they also argue that the Congressional bill imposing the Army's methods would make bad policy in the long run by stifling creativity and deterring serious study of a critical subject.
"We have been waiting for the opportunity to share our reporting on this critical subject with the American public," Andrew Heyward, the new president of CBS News, said last night in an official statement.
