#VOA慢速英语听力：NASA为火星飞行开发食品吧 搜索结果
WhenastronautsgototheplaMarsyearsfromnow,theywillneedtherightfoodtostaystrongandhealthy.AtNASA,theAmericanspaceagency,scientistsareworkingtocreatefoodproductsthatprovidenutritionwithoutweighingdownth
