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arduous[arduous 词源字典]

arduous: [16] Latin arduus, the source of English arduous, originally meant ‘high, steep’ (it is related to Greek orthós ‘straight, upright, correct’, as in English orthodox); the sense ‘difficult, laborious’ was a later metaphorical development. (The word has no connection with ardour, which comes ultimately from Latin ardēre ‘burn’; see ARSON.)
=> orthodox[arduous etymology, arduous origin, 英语词源]