然而，用文本约束细化类模型是耗费时间并且易于出错的任务。
However, refining class models with textual constraints is a time-consuming and error-prone task.
在细节展开或需求变更时细化或展开任务。
Tasks are refined or expanded as the detail expands or requirements change.
处于较高抽象级别的流程只能用来自较级别的流程进行细化，级别最低的流程只能包含全局和本地任务。
Processes at a higher abstraction level should only be refined with processes from a lower abstraction level, and the lowest level should only contain global and local tasks.
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