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The site shows example sentences for English words. How the word or phrase could be used in a sentence?
" ... In earlier times opals were prized throughout various cultures and thought to bring good fortune, good health and foresight. The Romans ranked opals as second only to emeralds and believed these gems symbolized hope and purity. The Ancient Greeks believed that opals brought prophecy. The word opal derived its name from “opalus”, which means “to see a change in color”. ... "