impurity control

例句：

1. 1. The company is implementing a new purity control system to ensure product quality.
   该公司正在实施一个新的纯度控制系统，以确保产品质量。
2. 2. The research team focused on the purity control of the new drug.
   研究团队专注于新药的纯度控制。
3. 3. The purity control measures are designed to prevent contamination during production.
   这些纯度控制措施旨在生产过程中防止污染。