Service composition is highly complex and often includes transactions, unit-of-work boundaries, error handling, security and propagation of credentials, and aggregation of business logic.
服务合成(service composition)是相当复杂的，而且常常涉及到事务、工作单元边界、错误处理、安全性与证书分发、以及业务逻辑聚合等方面的问题。
Moreover, the aggregation error rate is defined to evaluate the performances of geometric aggregation schemes more accurately.
定义了聚合误差率，以此作为准则来精确衡量几何聚合算法性能的优劣。
Firstly, it was pointed out that the unreasonable aggregation algorithm and constant hypothesis of the time-varying system were main sources of equivalent error.
首先，指出等值过程中不合理的聚类算法、对时变系统的定常化假设是误差主要来源。
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