1. They completed the arduous task ahead of time. 他们提前完成了这一艰巨的任务。
2. Those who seek it undertake an arduous journey and can never be sure that they will find it. 那些寻求正义的人走的是一条崎岖的道路,从来没有把握他们最终将到正义。
3. You will not have to spend the next few days recovering from a long and arduous journey. 用不着因为漫长的旅途的辛苦而花几天时间休息来恢复精神。