如何分別psychology,sociology同philosophy?

psychology係心理學
----studying human experience including thoughts, fellings and actions.
sociology係社會學
----study the ways in which social structures, social processes and cultural products constrain and enable human behaviour.
philosophy係哲學
----is a program for those interested in learning(and challenging) the wisdom of great, influential thinkers. It introduces you to a wealth of interesting, unconventional ways of thinking and inquiring.

Psychology: Have to know more about the mentality of the others, why people are unhappy

Sociology: All the social issues, just like liberla studies.

Philosophy: the theory of maybe, Chinese