例如，如果表达式不使用last函数，那么就不必执行先行处理来确定上下文列表中有多少元素。
For example, if the expression doesn't use the last function then it is not necessary to do look-ahead processing to determine how many elements there are in the context list.
作为民事诉讼保障制度之一的先予执行，是一种兼具先行给付和行为保全性质的制度。
As a kind of civil litigation guarantee systems the prior execution is the system that has a paid in advance and behavior preservation.
预存程序是先行编译的程序设计陈述式集合，它们会在资料库中执行作业，并且以一个名称储存及当做一个单位处理。
Stored procedures are a precompiled collection of programming statements that perform operations in the database, and are stored under a name and processed as a unit.
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