管理扩展的依赖关系和更新既不简单，也不易懂。
Managing the extensions dependencies and updates is not easy or straightforward.
传统的关系数据库管理系统通过 “向上扩展“的方式通过更好的硬件设施来提升系统性能。
Meanwhile, relational database management systems (RDBMS) “scale up” by getting faster and faster hardware and adding memory.
客户关系管理建立在以下原则的基础之上，即企业应该不断地扩展市场营销战略以加强客户的忠诚度。
Customer relationship management is based on the principle that marketing strategies should be continuously extended to strengthen customer loyalty.
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