All events associated with a single execution of the sample application are retrieved.

与样本应用程序的一次执行关联的所有事件被检索。

youdao

The problem is that EXPLAIN provides estimates for only a single execution of a given query.

但问题是，EXPLAIN提供的只是特定查询的一次执行的估计值。

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The next step is to create an instance of QueryExecution, a class that represents a single execution of a query.

下一步是创建QueryExecution的实例，这个类表示查询的一个执行。

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