If you ignore 1900, you can figure out if a given year is a leap year just by looking to see if the rightmost two bits are zero.

如果你忽略1900年，你就可以通过观察最右边的两位是否都为零来判断某一年是否为闰年。

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The two rightmost columns in table 1 represent two alternative index definitions, and the rows in the table show which of the predicates can (+) or cannot (-) be evaluated by either of the indexes.

表1最右侧的两列表示两个可选择的索引定义，表中各行展示了谓词可以(+)或不可以(-)由这两个索引进行计算。

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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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