vidarabine

例句：

1. 1.Vitamin B12 deficiency can lead to serious health problems.
   维生素B12缺乏可能导致严重的健康问题。
2. 2. The patient needed extra vitamin B12 supplements to recover from his illness.
   这名患者需要额外的维生素B12补充剂来从他的疾病中恢复。
3. 3. Researchers are studying the effects of vitamin B12 deficiency on cognitive function.
   研究人员正在研究维生素B12缺乏对认知功能的影响。