第二种方法是指标，指标是根据事件或预定义变量定义的公式计算出的值。
The second approach is metrics, which is the value calculated by the formula defined by events or pre-defined variables.
图16展示了一个查找属性文件的示例，后面用几个echo语句展示预定义变量现已可用。
Figure 16 shows an example of sourcing the properties file, followed by a few echo statements to show that the predefined variables are now available.
这种脚本的另一个功能是以一致的方式设置预定义的变量。
Another function of such a script is to set up predefined variables in a consistent way.
术语 "$<"是一个特殊的预定义的make变量，代表某条规则的 “源”。
The term "$<" is a special predefined make variable that refers to the "source" for a rule.
有一个预定义的变量 total_time，它代表整个数据收集过程的时钟时间。
You have a pre-defined variable named total_time for the wall-clock time of the whole data collection.
W3Eval有一些预定义的变量，不过它也支持用户定义的变量。
W3Eval has some predefined variables, but it also supports user-defined variables.
为了完成这些我们需要向脚本系统中添加预定义的全局变量。
To accomplish this we can add predefined global variables to our scripting system.
编译器将会在预定义的位置集查找该头文件，这些预定义的位置可以通过设置查找路径环境变量或者通过命令行选项来修改。
The compiler will look for it in a predefined set of locations, which can be modified by setting a search path environment variable or through a command line option.
指定脚本的运行环境。每种环境都有一组特定的预定义全局变量。
Environments - which environments your script is designed to run in. Each environment brings with it a certain set of predefined global variables.
每种环境都有一组特定的预定义全局变量。
Each environment brings with it a certain set of predefined global variables.
递增一个未预定义的局部变量要比递增一个预定义的局部变量慢9至10倍。
Inced hardy cap rementing an undefined local variable is 9-10 times slower than a pre-initialized one.
递增一个未预定义的局部变量要比递增一个预定义的局部变量慢9至10倍。
Incrementing an undefined local variable is 9-10 times slower than a pre - initialized one.
递增一个未预定义的局部变量要比递增一个预定义的局部变量慢9至10倍。
Incrementing an undefined local variable is 9-10 times slower than a pre - initialized one.
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