bed-load sampling

例句：

1. 1.The researchers conducted bed-load sampling to study the soil's composition.
   研究人员进行了床层采样，以研究土壤的成分。
2. 2. During the sampling process, the technician carefully collected samples from different layers of the soil.
   在采样过程中，技术员小心地从土壤的不同层次收集样本。
3. 3. Bed-load sampling is an essential technique for analyzing soil quality and assessing environmental impacts.
   床层采样是分析土壤质量以及评估环境影响的关键技术。