vital circuit

例句：

1. 1. The health of the population is vital to the economy.
   人口健康对经济至关重要。
2. 2. Vitamin C is vital for a healthy immune system.
   维生素C对健康的免疫系统至关重要。
3. 3.The company's survival depends on its ability to adapt to market changes.
   公司的生存取决于其适应市场变化的能力。