Supposeyouareavisito的甄选

问题详情：SupposeyouareavisitorinthelandofMongolia,somefriendsaskyoutoeatwiththem.Whatkindofmanners(礼貌)dotheywantyoutohave?Theywantyoutogivealoudburp(饱嗝)afteryoufinisheating.Burpingwouldshowthatyoul...