non-practical          
adjective (also nonpractical) uk/ˌnɒnˈpræk.tɪ.kəl/ us/ˌnɑːnˈpræk.tɪ.kəl/
 不实用的
relating to ideas or imagination rather than experience, real situations, or actions
  Traditional education involved learning a lot of non-practical stuff.
 I don't usually read non-practical books. 非实用的书我一般不看。 
  非动手的;非实际的
involving writing or talking rather than doing things
  The class sizes for non-practical subjects have steadily increased.
 I got a high score on the non-practical part of the test. 我在考试的非实践部分获得了高分。 
 - More examples
 - Speaking actually fulfils a number of nonpractical functions.
 - We should be taking non-practical considerations into account as well as considering the economic benefits of the project.
 - There might have been a non-practical reason why the city was built on this site.