To separate the parts of a block, for example, to select records from a block.

分离一个数据块的各个部分。例如，从某个数据块中挑选出若干记录。

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To select the best unit within an apartment block.

要在一所公寓选择最好的单位。

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To select the best unit within an apartment block.

要在一所公寓选择最好的单位。

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