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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The ozone oxidation of carbon black surfaces was studied.
研究了碳黑表面的臭氧氧化。
Then, as blazing sunshine alternated with drenching rains, the harsh, barren surfaces of the black rocks slowly began to soften.
然后，随着炽热的阳光和滂沱的大雨交替出现，黑色岩石粗糙而贫瘠的表面开始慢慢软化。
This illusion first discovered in 1870 is characterized by the "ghostlike" intermittent appearance of lightly colored gray dots that seem to connect the white surfaces and the black background.
这个错觉是在1870年首次发现的，其特点是：“诡异的”浅灰色圆点间歇性的出现，似乎连接着白色的表面和黑色的背景。
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