Sentence:  The system well <WSD>understands</WSD> that one of its primary responsibilities is to bring children and books together ; consequently an experienced children 's librarian at headquarters conducts a guidance program designed to promote well-planned library activities , cooperating with the children 's librarians in member libraries by means of individual conferences , workshops , and frequent visits . 
Meaning of the word marked with <WSD> tags:  perceive (an idea or situation) mentally