所有这些使得它成为一种实际可用的的支付系统的条件是：服务提供商必须要将唯一识别符与银行帐号或者信用卡链接起来。
All that's required to turn this system into a reliable payment mechanism is a service provider willing to link that unique identifier to a bank account or credit card.
相反，它只需要程序员将属性标记为持久性的，并识别出能代表对象唯一标识符(或者主键)的属性。
Instead, it requires the developer only to denote the attributes to be persisted and to identify the attribute to represent the object's unique identifier (or primary key).
例如，眼下并没有要求渔船必须有国际海事组织提供的识别码，它是全球公认且唯一的航运标识符。
Right now, for example, fishing boats aren't required to have an identification code from the International Maritime Organization, the only globally recognized identifier for shipping.
基于以上所述，可以将附件容器(清单5)实现成包含附件数据源的映射，并以附件标识符唯一识别。
Based on the above, the attachments container (Listing 5) can be implemented as a map that contains attachment data sources and are keyed by attachments identifiers.
三个识别符 ——name、category和release ——定义项目唯一性。
The three identifiers -- name, category, and release -- define the uniqueness of the project.
Etag是一个识别内容版本号的唯一字符串。
An ETag is a string that uniquely identifies a specific version of a component.
连续生产时，在最终批号确定前，可以将产品代码、日期和时间结合起来作为唯一的识别符。
In continuous production, the product code together with the date and time can serve as the unique identifier until the final number is allocated.
连续生产时，在最终批号确定前，可以将产品代码、日期和时间结合起来作为唯一的识别符。
In continuous production, the product code together with the date and time can serve as the unique identifier until the final number is allocated.
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