sample moment of order k

例句：

1. 1. The company sent a sample of their new product to the press.
   公司向媒体发送了新产品的样本。
2. 2. The scientist collected samples from different locations for further analysis.
   科学家从不同地点收集样本以便进一步分析。
3. 3.The teacher asked the students to provide a sample of their work for the presentation.
   老师要求学生们提供一份作品样本作为展示。