white yam

1. In West Africa, important crops such as wheat, potato, sorghum and soya will lose out, while more robust crops such as white yam, sugar cane and plantain will benefit from the higher temperatures.
   非洲西部地区，诸如小麦、马铃薯、高粱、黄豆等重要作物将面临颗粒无收的局面，而其他适应性强的作物，如大薯、甘蔗、大蕉等，可能因为气温升高而因祸得福。
2. "Botanically unrelated to the white, or irish, potato or the yam, sweet potatoes are oblong or pointed oval, tuberous roots."
   与白色（或爱尔兰）马铃薯及薯蓣无亲缘关系。甘薯为椭圆形或带尖的卵圆形块根
3. Thousands of people voted on the White House Web site to name the National Turkey marshmallow and an alternate called yam.
   数千网民在白宫的官方网站将这两只国家火鸡分别命名为果汁软糖和山药。

noun

1. grown in Australasia and Polynesia for its large root with fine edible white flesh

   Synonym:    water yamDioscorea alata