reference to variable

They hold only one piece of data: a string, a number, the undefined value, a reference to another variable.

它只保存一段数据：一个字符串、一个数字、未定义的值以及对另一个变量的引用。

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If you choose to pass a variable by reference, prefix it with&, and put it inside the []; for variable passing by value, prefix it with the equal sign (=).

如果选择通过引用传递变量，就在它前面加上&并把它放在[]内；对于通过值传递的变量，在它前面加上等号（=）。

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We also used an instance variable to store a reference to the mock object.

我们还使用了实例变量来存储对模仿对象的引用。

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A static variable which holds a reference to the single created instance, if any.

如果存在静态变量的话,使用静态遍历存储创建的单件类的简单实例.

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Submit description file commands use $ ENV ( EnvironmentVariableName ) to reference the value of an environment variable.

提交描述文件命令使用$ENV ( EnvironmentVariableName )引用环境变量的值.

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To facilitate this, the plug-in class implements the singleton pattern: It stores a reference to itself in a private class variable.

为了使这一点更方便，插件类实现单模式（singleton pattern）：它在私有类变量中存储一个自身的引用。

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