scratch pad-
These serve as a scratch pad for calculating values that are significant to message recipients .
这些临时变量用作计算那些对消息接收者很重要的值的高速缓存（scratchpad）。
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Tmp , or " temporary ," is the system-wide scratch pad .
tmp或者“temporary”，是系统范围的暂存存储区。
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In this way , the Rhino interpreter can function like a " scratch pad " in which to enter simple blocks of Java code for testing and debugging .
采用这种方法，Rhino解释器的功能类似于“便签本”，可以在其中输入简单的Java代码块进行测试和调试。