gravel-sand size ratio

例句：

1. 1.The engineer measured the grain size ratio of the soil before starting construction.
   工程师在开始施工前测量了土壤的粒径比。
2. 2.The company's product line is designed to maintain a consistent grain size ratio across all its products.
   该公司的产品线设计为在所有产品中保持一致的粒径比。
3. 3.The research team found that the grain size ratio in the sediment was significantly different from that in the water.
   研究团队发现沉积物中的粒径比与水中的显著不同。