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1·Please tell me the brand name, quantity and invoice number.

请告诉我品牌名称、数量以及发货单号码。

2·For example, it is possible to express that InvoiceType (type of Invoice number) cannot be subtyped, that is, no one can define a new version of InvoiceType.

比如，有可能表示InvoiceType (Invoice编号的类型)不允许子类型化，任何人都不能定义新版本的InvoiceType。

3·When, for example, a user creates an invoice for a customer without an ID number, most applications reject the entry.

例如，当用户创建一张没有顾客号码的发货单时，多数程序会拒绝输入。