XML查询计算：执行计划和新操作符。

XML query evaluation: Execution plans and new operators.

youdao

总计查询计算多组记录的小计。

A totals query calculates subtotals across groups of records.

youdao

运行时库没有机会分析程序并以最优的方式构建查询计算。

A runtime library has no opportunity to analyze a program and structure the query evaluations in an optimal manner.

youdao

If it was already there, I just look it up.

如果是已经计算过的值，我将查询后再调用它。

麻省理工公开课 - 计算机科学及编程导论课程节选