firmness of fat

例句：

1. 1.The firmness of the material is what makes it suitable for use in this application.
   材料的坚固程度是它适合这种应用的原因。
2. 2. The new policy has strengthened the firmness of the government's stance on environmental protection.
   新政策增强了政府在环境保护立场上的坚定性。
3. 3.The firmness of the soil affected the growth of the plants.
   土壤的坚硬程度影响了植物的生长。