Outer key selector 外键选择器
Inner key selector 内键选择器
primary key Selector 资料表主键选择器
selector key [电] 选择器电键 ; 选择机键
Key-Type Selector 控制类型
key touch selector 按键选择器 ; 触键选择器
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。
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