qualitative credit control

例句：

1. 1. The quality of the product is excellent.
   产品质量非常好。
2. 2. He was qualified for the job because he had experience in the field.
   他因为在这个领域有经验而有资格担任这个工作。
3. 3. The company's quality control measures are strict.
   公司的质量控制措施非常严格。