The index does not contain "price" elements at a deeper level, which may exist in the table and are potential matches for the predicate path $i//price.
索引没有包含更深层次的 “price” 元素，表中可能存在该元素且可能与谓词路径 $i//price 相匹配。
Positioning is not what you do to a product, but how you can change the name, the price, the packaging or other elements to secure a worthwhile position in the prospect's mind.
定位的意义不在于如何改变产品，而是如何改变名称、价格、包装或其他元素，在潜在顾客心中占据有价值的地位。
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