nitrocobalamin

例句：

1. 1.Vitamin B12 is essential for the health of our nervous system.
   维生素B12对我们的神经系统健康至关重要。
2. 2. The patient required a high dose of vitamin B12 to recover from his illness.
   这位病人需要高剂量的维生素B12来恢复他的疾病。
3. 3. The doctor prescribed the patient a daily dose of vitamin B12 to prevent further damage.
   医生给患者开了每日剂量的维生素B12，以防止进一步的伤害。