Multiple declarations are allowed with auto, but all deductions must lead to the same type.
auto支持多个声明，但是所有推导的结果必须是相同的类型。
Bags support multiple declarations for an object, such as multiple roles, and can be used when the sequence is not important.
包支持多次声明一个对象(比如多种角色)，并且可以在序列不重要时使用包。
By avoiding multiple namespaces, IXRetail can better limit occurrences of unintended equivalent declarations or definitions.
通过避免使用多个名称空间，IXRetail可以更好地限制无意识的等效声明或者定义的出现。
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