arduous
adj. 艰辛的，困难的
例句
The work was arduous.
这项工作很艰巨。
《牛津词典》
We must have patience in doing arduous work.
我们做艰苦的工作要有耐性。
《新英汉大辞典》
He never seeks credit for himself, but is always ready to take on arduous tasks.
他在荣誉面前从不伸手，但在艰巨任务面前却当仁不让。
