control of purity

例句：

1. 1.The company's commitment to environmental sustainability is a key factor in its control of purity.
   该公司对环境可持续性的承诺是其纯度控制的关键因素。
2. 2. The research team has developed a new method for controlling the purity of the product.
   研究团队开发了一种新方法，用于控制产品的纯度。
3. 3.The manufacturer has implemented strict controls over the purity of the raw materials used in their products.
   制造商已经实施了严格的原材料纯度控制措施。