That's because variables specified in a closure's use keyword are lexically scoped.
这是因为在closure的关键字use中指定的变量在词法上确定范围。
Lexically scoped variables refer to the local environment in which they were defined.
在词法上确定范围是指在本地环境中定义变量。
MXML files are, at heart, well-formed XML files, which means the XML namespaces serve the same purpose as any XML namespace does, that of keeping different tag names lexically scoped.
MXML文件本身就是一种合乎规格的XML文件，所以里面的XML命名空间跟一般的XML命名空间并无不同，即限定不同的标记名称的语法作用域。
MXML files are, at heart, well-formed XML files, which means the XML namespaces serve the same purpose as any XML namespace does, that of keeping different tag names lexically scoped.
MXML文件本身就是一种合乎规格的XML文件，所以里面的XML命名空间跟一般的XML命名空间并无不同，即限定不同的标记名称的语法作用域。
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