The subscriber may establish multiple subscriptions, if additional criteria need to be used.
如果需要使用额外标准，订阅者可以建立多个订阅。
The company plans to make money by selling subscriptions that give players access to additional levels and by selling virtual goods.
该公司计划依靠玩家预定获取附加级别以及销售实物来赚钱。
When invoking the operation, an HTTP authentication request collects additional context about which user's subscriptions to retrieve.
当调用这个操作时，HTTP 身份验证请求收集关于检索哪个用户订阅的附加上下文。
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