1.  arduous
2.  formidable
3.  onerous

• 1. 艰巨的: arduous | arduous difficult | difficult - hard | onerous
• 2. 艰巨的事业: enterprise
• 3. 艰巨的任务: challenge | Herculean task | Ballbreaker | A tall order

更多释义

• 1.我们面前有一项艰巨的任务。
  We have a formidable task ahead of us.
  dict.yoduao.com
• 2.这对你来说肯定是一项非常艰巨的任务。
  This must be a very difficult job for you.
  dict.yoduao.com
• 3.它是一项艰巨的工作，他们应该相应地获得报酬。
  It is a difficult job and they should be paid accordingly.
  dict.yoduao.com

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