The major design goal of Slice was to encapsulate the storage environment such that the application code remains exactly the same as in a typical single database usage.
Slice的主要设计目标是封装存储环境，以便于应用程序代码能够与在典型的单数据库中使用的代码保持一致。
An OpenJPA-based application currently using a single database can be reconfigured with Slice for a storage environment where data is partitioned across many databases.
一个使用单个数据库的基于OpenJPA的应用程序可以由Slice针对数据跨多个数据库分区存储的存储环境进行重新配置。
A slice represents a contiguous segment of an array, allowing a programmer to refer to specific sections of the underlying storage.
一个切片(slice)表示一个数组内的连续分段，支持程序员指定底层存储的明确部分。
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