The values indicate roles and responsibilities with respect to reviews: "r" for responsible; "a" for accountable; "c" for consulted, and "I" for informed.
它的属性值表示相关评审的角色和职责：“ R ”负责；“ A ”有责任；“ C ”咨询和“ I ”被通知。
A dictionary in Objective-C is an object that holds two sets of information, a unique key and associated values, and enables you to use the key to retrieve items.
Objective - c中的字典是一个具有两组信息(惟一的密钥和相关的值)的对象，且使您能够使用该密钥来检索条目。
Structures such as the global variable c have a deeper level of nesting than arrays do, and their values can be explored in a similar manner.
全局变量c之类的结构体的嵌套层次比数组更深，其值也可以用类似方法浏览。
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