But the ancient artisans did not know that these gold nanoparticles can be automatically broken down on the glass of pollutants, such as the new color of paint to maintain, but also clean the air.

• 但古代工匠不知道的是，这些金纳米颗粒能自动分解掉玻璃上的污染物，保持颜料色泽如新，而且还能清洁空气。