英语专业人士进OnereasonwhyitishardtodesignandteachsuchcoursesisthattheycutacrosstheinsistencebytopAmericanuniversitiesthatliberal-artseducationandprofessionaleducationshouldbekeptseparate,taughtindifferent

　　英语专业人士进

　　　OnereasonwhyitishardtodesignandteachsuchcoursesisthattheycutacrosstheinsistencebytopAmericanuniversitiesthatliberal-artseducationandprofessionaleducationshouldbekeptseparate,taughtindifferentschools.这里theycutacross他们打断中的they指代的是前面所述的课程还是一流高校,还有insistences后接by,个人理解是不是可以用of,用by如何解