difficult tasks ; tough tasks
... hard job n (difficult occupation) 苦差 hard job n (difficult task) 艰难的任务 hard knocks 跌跤，跟头，不愉快的经历 ...
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一项艰难的任务 a difficult task
完成艰难的任务 thread the needle
非常艰难的任务 hercules task
尽管我已经尽了最大努力，但我还是无法胜任这个艰难的任务。
Though I am trying my best, I am not able to equal to the tough task.
youdao
身为精锐突击队的成员，部队会派我们去执行艰难的任务。
As a member of an elite army hit squad, the army would send us out to do their dirty work for them.
《柯林斯英汉双解大词典》
奈从来没有放弃完成艰难的任务。
Nye never quite nails the jelly to the wall.
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