entity-relationship diagram

例句：

1. 1. The entity-relationship diagram is a visual representation of the relationships between entities in a system.
   实体关系图是系统实体之间关系的视觉表示。
2. 2.In this diagram, each entity is represented by a circle with its own attributes and relationships.
   在这个图中，每个实体用一个带有自己属性和关系的圆圈来表示。
3. 3.This diagram helps us to understand the complex relationships between different entities in our system.
   这个图帮助我们理解系统中不同实体之间的复杂关系。