vital principle

例句：

1. 1.The vital principle of life is to survive and thrive.
   生命的基本原理是生存和繁荣。
2. 2. The scientist discovered a new vital principle in the process of research.
   科学家在研究过程中发现了一种新的生命原理。
3. 3. This vital principle has been proven to be effective in treating many diseases.
   这一生命原理已被证明对治疗许多疾病有效。