五十音 http://www.nikkei.edu.hk/wp-content/uploads/2019/01/2019_50on1.mp3 濁音 http://www.nikkei.edu.hk/wp-content/uploads/2018/03/2019.06_50-2.mp3 拗音 http://www.nikkei.edu.hk/wp-content/uploads/2018/03/2019.06_50.2_拗音.mp3