此方法让您能够广泛地定制输出xml，包括其结构和样式。
This method allows you to extensively customize the output XML, including its structure and style.
print_r — 此命令只简单地打印所有变量，包括其结构。
print_r — This command simply prints any variable, including its structure.
介绍了一种预混式二次燃烧系统，包括其结构、工作方式、原理等。
A kind of premixed secondary combustion system was introduced in this article, including its structure, working, principium and so on.
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