Sometimes, the simplest ideas are the best. For example, to absorb heat from the sun to heat water, you need large, flat, black surfaces. One way to do that is to build those surfaces specially, on the roofs of buildings. But why go to all that trouble when cities are full of black surfaces already, in the form of asphalt (柏油) roads?
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And to breed the most productive hens which convert their feed most efficiently into eggs and are most resistant to disease, you need large flocks.
为了繁殖出这种特别吃得少，特别能下蛋，特别能抗病的“最有战斗力”的品种鸡，你需要更大的鸡群。
For example, you may need a large room where everyone can be together for keynote speeches or presentations, and smaller meeting rooms for informal group discussions.
例如，你可能需要一间大房间，在那里每个人都能聚在一起做主题演讲或演示，而较小的会议室则可以进行非正式的小组讨论。
"And if you need to predict human height in the near future to design a piece of equipment," Gordon says that by and large, "you could use today's data and feel fairly confident."
“如果你需要预测人类不久后的身高来设计一个设备的话，”戈登概括说，“你可以相当自信地使用当今的数据。”
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