而当政策已经按计划实施了之后（比如利率下降到了负值 ） ， 就必须实施如“量化宽松”这类非常规工具以激活增长和通胀。
This requires pushing interest rates as low as possible, and when these policies have run their course (such as when rates dip toward the negative), unconventional instruments like “quantitative easing” must be deployed to revive growth and inflation.