sample contamination

例句：

1. 1. The laboratory tested the samples for contamination before releasing them into the environment.
   实验室在将样品释放到环境中之前，对它们进行了污染测试。
2. 2.The company is accused of contaminating its products with harmful chemicals.
   该公司被控在其产品中掺入有害化学物质。
3. 3.The researcher collected samples from different areas to study their potential contamination risks.
   研究员从不同地区收集样本，以研究它们的潜在污染风险。