sample introduction

例句：

1. 1. The engineer needs to analyze the sample data for his report.
   工程师需要分析样本数据以供他的报告。
2. 2.The company is testing a new sample of paint on the wall.
   公司正在墙上测试一种新的油漆样本。
3. 3. The scientist collected several samples from different parts of the forest.
   科学家从森林的不同地方收集了几个样本。