The fetch function looks for a specific query.
fetch函数寻找一个特定查询。
The specific query here locates all minnows elements within each casting element.
这个特定的查询将查找所有在casting元素中的minnows元素。
Sometimes customers report a performance problem where a specific query is not performing optimally.
有时候客户报告的性能问题中说某个特定查询的执行没有优化。
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