We'll explore variable declarations and the val and var keywords in the section called "variable declarations" in Chapter 2, Type Less, Do More.
我们会在《第2章-打更少的字，做更多的事》的“变量声明”章节来探索如何使用val和var关键字声明变量。
But because it lacks a var declaration, it's a global variable.
但它缺少var声明，这是个全局变量。
Another unique variable is var.
另一个独一无二的变量是var。
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