也许这句话对你理解well off和prosperous:
Only by continuously increasing social accumulation can a country be prosperous and the people well off.
只有不断增加社会积累,一个国家才能兴旺,人民才能富裕.
well off指的是富裕,多修饰人.
prosperous指的是繁荣,修饰国家,社会,景象.
这是它们的本质区别.