arduous

• He mastered these words through the arduous consultation of the dictionary
  通过勤查字典，他掌握了这些单词。
• Not every astronomer thinks that adjustments will be arduous
  并非每位天文学家都认为时间的调校是个艰巨的任务。
• The journey was very arduous
  旅程非常的艰难。
• Having me as a father is an arduous undertaking , one that i imposed on you
  把我当作你爸爸不容易这些都要加到你身上
• Our task is arduous too , we need to pay more yuan to the cinema
  我们的任务也很重,我们需要支付更多的人民币给电影院
• Fire prevention is always a long - term and arduous task for us humankind
  一直以来,火灾防治是人类长期而艰巨的任务。
• It ' s an arduous task
  这是一项艰巨的任务。
• The traditional moral and arduous pioneering education of the minority nationalities
  论少数民族传统道德与艰苦创业教育
• After the accomplishment of the present task , there will follow a more arduous one
  完成目前任务后，还有更艰巨的任务。
• Weren ' t you worried taking such an arduous trip considering your health
  为了你的健康着想这样长途跋涉,难道你不担心吗