A customer standing in a store and armed with a smart phone can call up comparative prices from rivals - unless the item in question is only available at that particular store.
携带智能手机去商店购物的顾客，可以查询其他商家同种商品的价格——除非该商品只在那家商店有售。
2
Horizontal analysis, for example, a comparative financial statement, shows the dollar amount and the percentage change in each financial statement item from one period to the next.
横向分析如比较财务报表揭示了财务报表各项从上到下期的金额变动和百分比变动。
3
This concept says that a nation has a comparative advantage in an item if it can produce it more efficiently than alternative products.