unit weight of soil constituents

例句：

1. 1. The study of soil erosionis crucial for understanding the impact of humanactivities on the environment.
   研究土壤侵蚀对于理解人类活动对环境的影响至关重要。
2. 2. The constructionof a new road will require the unitweight of soil constituents to bedetermined beforehand.
   修建新路需要事先确定土壤成分的单位重量。
3. 3. The government hasimplemented strict regulations to control the unit weightof soil constituents in construction projects.
   政府实施严格的规定，以控制建筑项目中土壤成分的单位重量。