Try to model a simple Library system that has a number of shelves, and each shelf has a number of books that are arranged in a sorted order based on their title.

试着建立一个拥有一定数量书架的简单图书馆系统的模型，每一个书架拥有一些按其名字排序的书籍。

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Air travel still relies on a ground-based tracking system from the 1950s, which forces planes to use inefficient routes in order to stay in contact with controllers.

自上世纪50年代以来，航空服务一直依赖于地面导航的航道系统，飞机被迫按低效航线飞行，以与空中交通管理员保持联系。

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Let's suppose that a company called ACME has an order tracking system based on a Domino server infrastructure.

我们设想了一家叫做ACME的公司，该公司有一个基于Domino服务器基础设施的订单追踪系统。

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Customers can order a PC-based system and pick from licensed game packs from companies like Atari, Midway, Sega, and Capcom, or plus in their own Xbox 360 or PlayStation 3 and use the cabinet and its large screen and durable controls for a retro gaming experience.

FORBES: TRON '80s Nostalgia Entices Older Gamers to Go Retro with Custom Dream Arcades

In 2004, Howard Dean as a candidate sought to build on an employer-based health care system in order to cover millions of Americans that currently lack coverage.

WHITEHOUSE: Press Briefing

Richardson also proposes the implementation of a market-based cap and trade system for greenhouse gas emissions in order to create incentives for the electric and industrial sectors to make significant reductions in their carbon emissions.

FORBES: '08 Tracker: November