It requires effort and investment, which is why all highly prosperous capitalist democracies are characterized by massive investments in the middle class and the infrastructure that they depend on.
这需要努力与投资， 这就是为什么 所有高度繁荣的资本主义民主 都以发展中产阶级为特点， 并给予中产阶级 有依靠的基础设施。