The Riddle of the Rosetta Stone, by James Cross Giblin. The hieroglyphic passage took the longest to translate, partly because the hieroglyphs were the least understood of the three languages, and partly because so much of the text was missing. Champollion succeeded in deciphering a large part of the passage, but the meaning of many hieroglyphs was still unknown when he did his major work in the 1820s. Which line from the​ excerpt best states the central idea