If you want to learn Chinese from the basic level to fluency gradually, this is the ideal textbook series for you. ■■■ The functions of the APP: ■high quality recording for Pinyin, words, collocations, sentences, etc. for you to imitate ■ animate presentaion of how to write Chinese characters ■ a number of collocations for each Chinese word ■ Excellent audio lessons! Learn Chinese as the Chinese primary school students do and with the APP, you will never fail.