较低层次的是特性，用例和补充规约。
On the lower levels are features, use cases, and supplementary specifications.
该算法针对活动的恢复策略进行层次式的向上规约处理，动态确定补偿终止点，可有效减小补偿域。
The algorithm determines the end compensation point dynamically in a hierarchical bottom up manner, so the compensation sphere is confined and compensation costs are reduced.
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