求翻译：“中产阶层”们有一定的知识、品位和稳定收入，随着经济基础的日渐扎实，他们开始注重追求精致的生活品质。他们中的一些人或许每个月都有固定的奢侈品消费支出，但消费理性。是什么意思？

"Middle class" who has some knowledge, taste and a stable income, as growing in economic foundation is solid, they began to focus on the pursuit of exquisite quality of life. Some of them are maybe fixed every month luxury consumer spending, but rational consumption.