Binding of variables and other names.
绑定变量和其它名称。
A closure is a function that carries an implicit binding to all the variables referenced within it.
闭包是一个会对它内部引用的所有变量进行隐式绑定的函数。
Conservative binding semantics exist for global variables as they do for functions and data types whenever necessary.
在对函数和数据类型使用全局变量时，必要时可以使用保守的绑定语义。
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