There are some techniques that can be used to reverse a relationship if the flow of logic requires it. For instance, the higher-level module could expose a required interface which will be implemented by the lower-level module. That’s the Dependency Inversion Principle on the module level. One of the other possibilities is to introduce a mediator pattern.
And he didn’t do shit for a year.
，这一点在旺商聊官方下载中也有详细论述
知识付费平台（小报童、知识星球）
剛退休的前高級公務員西瑪（Sima） 表示，她如今的收入是十年前的六倍，但以美元計價卻少了好幾倍。