Level 3 begins to define the typical business activities that may be conducted within the level 2 entities, such as issuing customer orders, authorizing credit, and tracking order handling.
第3级开始定义在第2级的实体中可能进行的典型业务活动，如发出客户订单、信用卡授权以及跟踪订单处理等。
For documents such as job resumes, product descriptions, and customer orders, XML documents might be a suitable format.
对于工作履历、产品说明和客户订单等文档，XML可能是最合适的格式。
A relation is defined between two tables by specifying key columns that link the tables, most commonly regular relations such as customer-to-orders.
两个表之间的关系通过指定链接表的键列来定义，最常见的常规关系比如“客户-订单”。
Communicate with staff from other areas in the organization, such as production, warehouse, transport, or distribution to confirm the status of orders and resolve customer complaints.
与公司及其他单位、其他人员沟通，如生产、仓库、交通和配送，确认订单情况，解决客户抱怨。
Communicate with staff from other areas in the organization, such as production, warehouse, transport, or distribution to confirm the status of orders and resolve customer complaints.
与公司及其他单位、其他人员沟通，如生产、仓库、交通和配送，确认订单情况，解决客户抱怨。
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