Negotiating a reduction in nuclear arms is a long and arduous undertaking.
有关削减核武器的谈判是一项漫长而艰苦的工作
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。
Although the work was arduous, he finished it in a short time.
虽然这项工作很费力，他仍然很快就做完了。
