extrinsic staining

例句：

1. 1.The stain on the fabric is due to extrinsic factors.
   这件衣物上的污渍是由于外因造成的。
2. 2. The researcher found that extrinsic factors could significantly affect the quality of the product.
   研究者发现，外因因素可以显著影响产品的质量。
3. 3.The company decided to implement a new policy to reduce extrinsic factors in its operations.
   该公司决定实施一项新政策，以减少其运营中的外因因素。