purposive sampling

例句：

1. 1.The company's marketing strategy is purposive in its approach to customer acquisition.
   公司的营销策略在客户获取方面是有意为之的。
2. 2. The research was purposive in its analysis of the data.
   这项研究在分析数据时是有目的的。
3. 3.The teacher used a purposive approach to engage students in the lesson.
   老师采用了一种有目的的方法来吸引学生参与课堂活动。