weak homology group

例句：

1. 1.The weak homology group of the two species is very small.
   这两个物种的弱同源群组非常小。
2. 2.The weak homology group has a limited genetic diversity.
   这个弱同源群组遗传多样性有限。
3. 3. The weak homology group is difficult to study due to its small size.
   由于其规模较小，这个弱同源群组的研究难度较大。