Schedule difficult tasks for times you feel good, saving easy ones for when you're tired.

把困难的任务安排在你感觉好的时候，把简单的任务留到你累的时候做。

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All her life, Kelly had stuck with difficult tasks and challenges, and triumphed.

凯利在一生中遭遇了种种艰巨任务与挑战，但成功了。

《柯林斯英汉双解大词典》

Start on your most difficult tasks for the week first thing Monday morning.

在星期一的早晨把它作为你最难的工作的开端。

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Their memory improved, and they persisted more on difficult tasks.

他们的记忆力得到改进，面对困难任务时更有持久力。

哈佛公开课 - 幸福课课程节选

And, in support of the second alternative, even adults find these tasks involving lying and deception more difficult.

即使成年人也会发现,包含谎言与欺骗的任务要更加困难,这支持了第二种观点

耶鲁公开课 - 心理学导论课程节选

One of the most difficult tasks for a young independent business woman is pricing her services.

FORBES: Pricing Your Services: What Would a Dude Have Done?

Farmers and ranchers put in long hours to accomplish difficult tasks -- rain or shine.

WHITEHOUSE: The White House

One of the most difficult tasks when developing these nanobots is creating and maintaining propulsion.

CNN: Nanobots get to the heart of the matter