相关反馈式查询可能至少有这样几种情况：（1）用户的后续查询(subsequent queries)可以对其不够具体的初始查询(initial query)进行细化、具体化。这种情况是相关反馈技术所期望发生的。
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Subsequent Customer Queries 待以后主顾查问
However one of these queries is blocking subsequent queries.
然而一个查询是阻断后续查询。
Flush early and often as subsequent queries within the same transaction will NOT see NON-flushed data.
尽早且频繁地刷新缓存(Flush)，同一事务中接下去的查询就不会再看到未刷新的数据。
Initial execution of any query includes the costs of building up a query cache to enable faster execution of subsequent queries.
任何一个查询的首次执行都包含了构建一个查询缓存的性能损耗，以利于提高后续查询的执行速度。
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