清除溢出的物质是一项艰巨的任务。

It was a hard task to remove the spilled substance.

youdao

我们面前有一项艰巨的任务。

We have a formidable task ahead of us.

《柯林斯英汉双解大词典》

给这些树浇水对一个人来说是一项艰巨的任务。

To water the trees was a difficult task for one man.

youdao

That is going to be the challenge.

这将成为一项艰巨的任务。

麻省理工公开课 - 固态化学导论课程节选

What we've seen is a testing of the system -that we have regulatory requirements, that banks have enough capital -but this regulation is challenging because it's being stressed right now.

我们列举的这些案例都是对银行体系的考验,我们需要加强监管,以确保银行有充足的资本,但监管确实是一项艰巨的任务,因为现在面对的压力更大了

耶鲁公开课 - 金融市场课程节选