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within a relatively short period of time (If the petroglyphs were made within a relatively short period of time, they may tell a story, said James Dodd, a researcher at Aarhus University in Denmark and the Tanums Hällristningsmuseum's Rock Art Research Centre Underslös in Sweden.  livescience.com ART Vancouver) | |||
| over a relatively short period of time (контекстуальный перевод Alex_Odeychuk) | |||