如果读取购物车所返回的条目对象实现了分类、交货期和价格方法所要求的接口，则该过程不需要进行任何复制。

If the item objects returned from reading the shopping cart implement the interfaces required by the catalog, lead times, and prices methods, no copying at all is necessary in the process.

youdao

索引idx4和idx5包含了用于一个特定名称空间的索引条目，但是因为查询6是查找任何名称空间中的书籍价格，所以这两个索引不能用于查询6。

Indexes idx4 and idx5 contain index entries for one specific namespace but cannot be used for query 6 that looks for book prices in any namespace.

youdao