新概念英语全四册国际版 is an iPhone application designed to help you improve your English proficiency and boost your competitiveness. The program offers a simple and practical interface to provide robust assistance in your language learning journey. It supports synchronous playback of audio and original text, allowing you to repeat specific sentences with a single click or play individual sentences while paused.

Moreover, this app enables background playback and offers options for single-lesson, single-unit, or full-course loop playback. You can click on a word to hear its pronunciation and loop play unfamiliar vocabulary within a lesson. Additionally, users have the flexibility to adjust the playback speed of the original text audio according to their preferences.