It's a hard assignment to pull off, and I have some methodological concerns with the study.

这是一个艰巨的任务，而且我对此研究在方法层面便存有担心。

youdao

We accepted a very hard assignment.

我们接受了一项很困难的任务。

youdao

Neither of them has written such a long essay before, so they have been working hard on this difficult assignment.

她们俩都从未写过这么长的报告，因此她们一直在做这个难写的作业。

youdao

This is kind of... it's like, it wasn't really a hard assignment.

这有点……其实倒不是真的很难。

考试考砸了怎么办 - SpeakingMax英语口语达人

Her success in life thus is the product of continuous hard work in a career where she never turned down an assignment.

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