雅思写作素材：knowledgevs.training

　　Take mathematics for example. Many people are under the impressions thatadvanced mathematical study in university is so theoretical that it does nothave any practical value. However, the truth is that, ours is an age in whichall areas of science are permeated more and more by methods and approachesderived from theoretical knowledge in mathematics. Even marketing, once believedto be just an art of persuading people to buy, is now becoming a scientificsubject based on statistical studies of market data, which requires profoundmathematical knowledge.

　　2. Practical trainings are based on theoretical knowledge. / Practicaltrainings and theoretical studies are interrelated.

　　a) Some professions require that people have solid understanding intheoretical knowledge before going into practice in those professions.