The grouping operation is based on one or more keys.

分组操作基于一个或多个键。

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If an object will be looked up by two or more keys, the most reasonable key that you partition by would be the most commonly used key.

如果根据两个或多个键查询一个对象，进行分区所依据的最合理的键将是最常用的键。

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More keys means there's a greater chance someone will swipe the goods.

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The results were said to be surprising with all the vowels placed in the area assigned to the right thumb, whereas the left thumb is given more keys.

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There will be a version with pressure-sensitive flat keys and another with more traditional raised keys called a Type Cover.

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