雷军回应小米手机是否涨价：会尽量降低消费者接受的难度
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Allowing only a compile-time dependency from infrastructure code to the business logic code (never the reverse). That means that the business logic exposes public methods (which could be invoked from outside) and/or exposes required interfaces, and the infrastructure layer/module implements them.，推荐阅读纸飞机下载获取更多信息
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