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.
First-class polymorphism (System F)
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田轩：要有立法支撑，需要推动修改《中华人民共和国公司法》《上市公司治理准则》等法律法规，明确协会的法律地位和职能权限。