Find : Locate an entity by its primary identifier.
find:通过实体的主标识符查找实体。
The arguments of a find operation, for example, are the type of entity and its primary identifier.
例如,find操作的参数是实体类型及其主标识符。
The master slice is used to generate the primary identifier for managed instances, whenever required.
这个主片被用来在任何需要的时候为管理实例生成主标识。
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