The virtualstack -- like a real stack -- is a last in-first out (LIFO) data structure that temporarily stores function arguments and function results.
虚拟堆栈与实际堆栈类似，是一种后进先出（LIFO）的数据结构，可以用来临时存储函数参数和函数结果。
2
Each virtual image is specified with a software stack object.
每个虚拟映像都使用软件堆栈对象指定。
3
The concept is simple: avoid all installation and configuration hassles by using a virtual image of an entire software stack: operating system, application (s), configuration data, etc.