This is a rather challenging task, but you made it!

这是一项很有挑战性的任务，但你成功了！

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Due to the uncertainty of human, the control for the human-in-loop systems is a rather challenging problem.

由于人本身的不精确性，有人参与的管理和控制比起传统控制更具有挑战性。

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Mediocrity like a duck, as it refuses to refuse a life of ease, but rather challenging environment, challenging the sky.

它拒绝像鸭子那样碌碌无为，拒绝安逸的生活，而宁愿挑战环境，挑战天空。

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He also indicates that it is rather challenging to figure out how to apply the same tax to e-cigarettes since the excises tend to be based on weight of tobacco.

FORBES: Will E-cigarettes Become A Taxing Experience ?

Much of my time is spent on partnerships, which can have rather challenging agreements to interpret, but I know when I am done, that all the income and deductions will be allocated to somebody.

FORBES: Are Divorce Attorneys Trying To Whipsaw IRS ?

Rather than challenging women to be "mom enough, " he urged mothers to be "good enough" -- bottles of formula included.

CNN: Breastfeeding is intuitive and easy? No!