五十音 http://www.nikkei.edu.hk/wp-content/uploads/2018/03/2018_50on1V2.5.mp3 濁音 http://www.nikkei.edu.hk/wp-content/uploads/2018/03/2018_50on2v2.mp3 拗音http://www.nikkei.edu.hk/wp-content/uploads/2018/03/2018_50on3v3.mp3
