仅当状态管理器正在跟踪关系实例时，才允许已删除的元素。

Deleted elements are allowed only when the state manager is already tracking the relationship instance.

youdao

仅当状态管理器正在跟踪关系实例时，才允许已删除的元素。

Deleted elements are allowed only when the state manager is already tracking the relationship instance.

youdao