mixed soil sample

例句：

1. 1. Theresearcher collected a mixed soil sample from the site for further analysis.
   研究员从现场采集了一个混合土壤样本以便进一步分析。
2. 2.The scientist used a mixed soil sample to study the effects of climate change on agriculture.
   科学家使用一个混合土壤样本来研究气候变化对农业的影响。
3. 3. The farmers were asked to provide a mixed soil sample for testing the fertility of their land.
   农民被要求提供一份混合土壤样本以测试他们土地的肥力。