direct sampling method

例句：

1. 1. In thisstudy, we used a direct sampling methodto collect data from the field.
   在这项研究中，我们采用了直接采样法来收集现场的数据。
2. 2. The researcher applied a directsampling method to ensure the accuracy of theresults.
   研究员应用了直接采样法以确保结果的准确性。
3. 3. The company decided to implement a directsampling method to improve its product quality.
   该公司决定采用直接采样法来提高其产品的质量。