and to prove that the brown coating that we see today was not done by Leonardo da Vinci, which left us only the other drawing that for five centuries we were not able to see, so thanks only to technology.
并证明了这些我们所看到的褐色外层 并不是出自达芬奇之手，从而让我们 五个世纪都无人看到这些画作， 所以除了感谢科学还是只能感谢科学。