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used in Unbroken by Hillenbrand

2 uses
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difficult  — especially requiring great effort over an extended period of time
  • The Japanese government made contracts with private companies to send enlisted POWs to factories, mines, docks, and railways, where the men were forced into exceptionally arduous war-production or war-transport labor.
    p. 234.8
  • The work was extraordinarily arduous and often dangerous, and shifts went on day and night, some for eighteen hours.
    p. 280.3

There are no more uses of "arduous" in Unbroken by Hillenbrand.

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