基础架构和设计注意事项。
今后的专栏将着眼于帮助进行转换的特定代码和工具；本专栏则侧重于设计注意事项。
Future columns will look at specific code and tools to aid the transitions; this column addresses the design considerations.
本系列涉及演化架构和紧急设计，因此将从一些定义、注意事项和其他基础设置入手。
This article series concerns evolutionary architecture and emergent design, so it makes sense to start the series with some definitions, considerations, and other ground-setting.
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