s characterized by effort to the point of exhaustion; especially physical effort
a. 艰苦的, 费劲的, 勤劳的
1. The laborious task of cleaning the garage took all weekend.
清理车库这项繁重的任务花了整个周末。
2. She found the laborious process of studying for exams very challenging.
她发现为考试复习的艰苦过程非常具有挑战性。
3. Writing a research paper can be a laborious effort, but it is worth it.
写一篇研究论文可能是一个艰巨的努力，但这值得。