订阅和发布系统：在某些情况下，一个系统可以同时向分类法建模系统进行订阅和发布。
Subscribing and publishing systems: in some cases, a system can both subscribe and publish to the taxonomy modeling system.
订阅和发布系统：在某些情况下，一个系统可以同时向分类法建模系统进行订阅和发布。
Subscribing and publishing systems: in some cases, a system can both subscribe and publish to the taxonomy modeling system.
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