When you learn mathematics, whether in books or in lectures, you generally only see the end product - very polished, clever and elegant presentations of a mathematical topic.
当你通过阅读课本或者听讲座来学数学，你通常只看到最终结果——精雕细琢，聪明而且优雅的数学展览。
Or could it be that the greater draw is that Android is a complete, polished, elegant phone OS with built-in software library—and it doesn’t cost the phone maker a penny?
或者，有可能更大的吸引力来自于Android更完整，无瑕，精确，并有内置软件库的手机操作系统，——而且它不花手机制造商一分钱？
Elegant and classic, the hotel features polished marble and natural stone elements through the lobby and entrance to ensure a dramatic arrival.
典雅与经典，酒店采用抛光大理石和天然石材元素通过大堂和入口处，以确保一个戏剧性的到来。
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