A collection of name-value pairs.
名称-值对集合。
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Attribute value pairs cannot be minimized.
不能最小化属性值对。
These elements are used to provide key/value pairs.
这些元素通常以键／值对方式提供。
In a document database, such as CouchDB or MongoDB, documents are key-value pairs.
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In fact there only circumstance where such an index has value is when the Sharpe ratios of all component stocks and the correlations between all pairs of stocks in the index are equal.
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