Take purchasin for example. You need to have a grasp of the trends in politics, economics, sociology, indeed every area, and know which topics have the potential for development, and which scholar's work is worth paying attention to.
就以採購來說，必須掌握政治、經濟、社會… … 每個範疇的方向，知道那個題目有發展潛力、那個學者的著作值得注意。