Slide bài giảng buổi 4

<p><a href="https://docs.google.com/presentation/d/1E4tinhkpjpGqNUVYinTrFtRrJkJ-IzF…; (Slide bài 2)</p><p>&nbsp;</p><p><a href="https://docs.google.com/presentation/d/1UAQ1RiXvcdVPrJl3z0DtPO3yNqqqCg_…; (Slide bài 3)</p><p>&nbsp;</p><p>Kênh luyện nghe: chinesepod, <a href="http://www.youtube.com/@DANLIAOFreeToLearnChinese">www.youtube.com/@DAN…;