vitamin B↓6 deficiency

例句：

1. 1. The patient's blood tests showed a vitamin B12 deficiency.
   病人的血液测试显示他有维生素B12缺乏症。
2. 2. This diet is rich in vitamins and minerals, which can help prevent vitamin B12 deficiency.
   这种饮食富含维生素和矿物质，可以帮助预防维生素B12缺乏症。
3. 3. The elderly often suffer from vitamin B12 deficiency due to poor nutrition.
   老年人往往因为营养不良而患有维生素B12缺乏症。