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.

youdao

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.

youdao

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.

youdao