不过，属性系统本身会在内部呼叫和公开回呼，以做为相依性属性系统的一部分。

However, the property system itself calls and exposes callbacks internally, as part of the dependency property system.

youdao

不过，属性系统本身会在内部呼叫和公开回呼，以做为相依性属性系统的一部分。

However, the property system itself calls and exposes callbacks internally, as part of the dependency property system.

youdao