non-metallic inclusion

例句：

1. 1. The steel was contaminated with non-metallic inclusions during the manufacturing process.
   在制造过程中，钢材被非金属夹杂物污染。
2. 2.The engineer found that the non-metallic inclusions were causing the machine to malfunction.
   工程师发现非金属夹杂物导致了机器故障。
3. 3. The research team analyzed the samples and identified several non-metallic inclusions that could be harmful to human health.
   研究团队分析了样本并识别出几种可能对人类健康有害的非金属夹杂物。