The path /book/price identifies all price elements that are immediate children of the element "book."

路径 /book/price 识别了所有 price 元素，它们是元素 “book” 的直接子元素。

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The fourth predicate $i/*/price = 29 looks for price elements under any root element, not just "book."

第四个谓词 $i/*/price = 29 将查找任何根元素下的 price 元素，而不仅仅是在 “book” 元素下的。

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Not only "price" elements can fulfill this predicate.

不仅是 “price” 元素可以满足该谓词。

youdao

For one thing, the retailers complain, it ignores the elements other than price which might make a shopper choose one store over another, such as service.

ECONOMIST: Intelligent agents

Mr. Graham proposed that the price of every stock consists of two elements.

WSJ: Intelligent Investor: Don't Bet the House on Efficient-Market Model

Jobs has paired the new phone with a lower price point and worldwide availability--two elements clearly designed to make its sales pop worldwide.

FORBES: 3G iPhone: Calling The World