Rome may be the eternal city, but its ancient artifacts are under unrelenting assault by the ravages of time, pollution, acid rain and the sweat and breath of millions of tourists. The Arch of Septimius Severus in the Roman Forum, for one, has the grime of 18 centuries caked onto its surface.
원문출처 : https://www.cnn.com/style/article/bacteria-art-restoration/index.html
원문출처 : https://www.cnn.com/style/article/bacteria-art-restoration/index.html