Get sound file from web-page player

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http://superuser.com – I am trying to get sound file from web pages like this: http://china.cnr.cn/news/201310/t20131018_513867335.shtml (I am learning Chinese and this is good audio+text news source). It is seams like usual flash player, but no Firefox addons can get this audio file (Download helper, Flashgot and something else). They just don't see it. It there a way to download this audio? (HowTos)