backward branch of diffraction curve

例句：

1. 1. The tree's backbone is the main trunk, with several branches extending from it.
   这棵树的主干是主要的，从它延伸出几根分支。
2. 2. In the study ofgenetics, the concept of aretrograde branch is used to describe howgenes can be passed down through generations.
   在遗传学研究中，逆行分支的概念被用来描述基因如何通过世代传递。
3. 3.The researcher found that the backboneof the new drug was effective in treatingcertain diseases, but the branches were notas strong.
   研究人员发现新药的骨架对治疗某些疾病有效，但分支不够强大。