翻译下方句子中的划线部分，学习有关质量保证的表达方式。 1. Quality control is a series of activities that ensure and improve the quality of products and services. 2. The goal of statistical quality control was to gather data that would allow for the constant improvement of manufacturing processes. 3. In Deming.s own words, “the basic cause of sickness in American industry and the resulting unemployment is a failure of top management to manage.” 4. Strong leadership is one of the “must haves” in Deming.s quality control system. 5. It was in the 2000s that most Chinese firms realized empowerment was a significant issue.