World vectors are required by beginners and by more experienced users accessing advanced or seldom-used functions. Head vectors are used extensively by intermediates and even more so by experts.

• 世界途径是初学者需要的，经验丰富的用户在访问高级的或者极少使用的功能时也需要它；头脑途径则由中间用户广泛地使用，甚至更多地由专家用户使用。