Each entity must have a unique entity key within an entity set.
实体集内的每个实体必须要有一个唯一的实体索引键。
The entity key for the instance is unique within the entity set.
实例的实体键在该实体集中是唯一的。
The properties that make up an entity key are chosen at design time.
构成实体键的属性是在设计时选择的。
The properties that make up an entity key for a given entity type cannot change.
构成给定实体类型的实体键的属性不可更改。
However, some (but not all) of the values that make up an entity key can be the same.
但是，构成实体键的部分(而不是全部)值可以相同。
The properties that make up an entity key should be chosen to guarantee uniqueness of instances in an entity set.
在选择构成实体键的属性时应确保实例在实体集中的唯一性。
The values of entity key properties must uniquely identify an entity type instance within an entity set at run time.
实体键属性的值必须在运行时唯一标识实体集中的实体类型实例。
The values of entity key properties must uniquely identify an entity type instance within an entity set at run time.
实体键属性的值必须在运行时唯一标识实体集中的实体类型实例。
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