对输入或输出消息中的数据类型的大部分变更都不是向后兼容的。
Most changes to the data types in the input or output message are not backward compatible.
按照当前方法设计的系统，大部分变更都以极高的运营成本人工处理。
With a system designed based on current approaches, most of the changes are handled manually at a great operational cost.
在通信系统中，前期设计阶段就要考虑系统变更频繁的情况，使得部分变更不要影响到系统的整体规格。
During the initial phase of design, it is necessary to modify or change system requirements which may influence the whole design specification.
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