Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key.
依据指定的索引键选择器函式来群组序列的项目，并从每个群组及其索引键建立结果值。
Rules with a tag selector as the key.
标签选择器作为键的规则。
The engine evaluates each rule from right to left, starting from the rightmost selector (called the "key") and moving through each selector until it finds a match or discards the rule.
该引擎由右至左评估每个规则，从最右边的选择器开始(称为“键”【Key】)，并通过移动每个选择器，直到找到一个匹配或丢弃的规则。
The key components of DTC is the state selector.
它的关键部件是状态选择器。
The row selector displays a key symbol if the column is in the table's primary key.
如果该资料行位于资料表的主索引键，资料列选择器将显示索引键符号。
You need to create the key bindings with a context for selector.
你需要创建为选择器的上下文的键绑定。
A primary key column is identified by a primary key symbol in its row selector.
主键列由其行选择器中的主键符号标识。
In Table Designer, click the row selector for the database column you want to define as the primary key.
在表设计器中，单击要定义为主键的数据库列的行选择器。
In Table Designer, click the row selector for the database column you want to define as the primary key.
在表设计器中，单击要定义为主键的数据库列的行选择器。
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