the model that i am proposing(计划打算) in this book derives(得自、起源) its strength from five features. the first of these is its unabashed immodesty in attempting to be general, to combine in a single theory all aspects of second language learning.
its very generality makes it possible to consider within one model second and foreign language learning , learning for general and specific purpose , formal and informal learning, developing knowledge and skills , to mention just a few of the ways theories are sometimes specialized