计算机通常只生成伪随机数。

Computers usually only generate pseudorandom Numbers.

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在测试中，客户机将查询范围调整为整体地震数据集的一部分，并生成一系列伪随机请求。

In testing, the client generates a pseudo-random series of requests with the query ranges adjusted to cover some portion of the total set of earthquakes.

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LEVEL—伪列LEVEL返回一个整数值，表示所生成行的分层结构中的递归步骤。

LEVEL - the pseudo column LEVEL returns an integer value that represents the recursive step in the hierarchy at which the row was produced.

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