in vivo neutron activation analysis

例句：

1. 1. The study of this material is crucial for understanding its biological properties in vivo.
   研究这种材料的目的在于理解其在体内的生物学特性。
2. 2. The researchers used the technique to analyze the DNA of living cells.
   研究人员使用这种方法来分析活细胞的DNA。
3. 3.The in vivo neutron activation analysis was crucial for determining the chemical composition of the bone tissue.
   活体中子活化分析对于确定骨组织化学成分至关重要。