清单4显示了从外部环境导入变量并将其简单地输出到屏幕上的闭包示例。

Listing 4 shows an example of a closure that will import a variable from the outside environment and simply print it out to the screen.

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你将要用到的样例模型是一个简单的HelloWorld程序，和所有的HelloWorld程序一样，这个程序是把“ Hello World ”输出到屏幕。

The sample model you're going to use is a simple HelloWorld program, which does what all HelloWorld programs do and prints "Hello World" to the screen.

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