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 public List<ItemDetail> queryItemDetails(List<Cart> carts){
　　  ItemRepository itemRepository=...;　
        List<ItemDetail> result = List.newArrayList();
        
 
        List<SkuId> ids = buildItemSkuIds(carts);
        result = itemReposioty.query(itemSkuIds);

        //Do some additional things to the result...
            
        return result;
}