【解答】
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(1) the もしくは River (Scientists have discovered a long-buried branch of the / River Nile that once flowed alongside more than 30 pyramids in Egypt, ...)
(2) river もしくは branch (The existence of the river / branch would explain why the 31 pyramids were built in a chain along a now inhospitable desert strip in the Nile Valley between 4,700 and 3,700 years ago.)
(3) nobody (But nobody was certain of the location, the shape, the size, or proximity of this mega waterway to the actual pyramids site.)
(4) according (Surveys in the field and cores of sediment from the site confirmed the presence of the river, according to the study in the journal Communications Earth & Environment.)
(5) played
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