When you add to the equation, you are referring to a structured auditory learning system. This is not a passive listening exercise. The "work" signifies active engagement: shadowing, repetition, and contextual recall.
: The work faced a significant legal challenge in the mid-2000s regarding plagiarism of Cho Hwa-yoo's This is American English . This led to the temporary withdrawal of the book and subsequent revisions that settled the copyright disputes. Practical Utility for Learners nexus english expression dictionary mp3 work