低于Forgetting index below设置值的元素，将不延期。

(2017-12-03-周日 20:59:41)

For example, if you set Forgetting index below to 5%,items with the forgetting index of 3% and 4% will not be rescheduled. This way you can make sure that the most important items in your collection are protected from a drop in retention

例如,如果你把遗忘指数设置在5%以下，在3%和4%的遗忘指数的项目将被推迟。通过这种方式，您可以确保集合中最重要的项是从保留中减少的。