他正试图完成一次艰苦任务。

He is attempting a difficult task.

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而运动队群体的主要工作任务是复杂而艰苦的训练、比赛。

The main task of sports group is the complex and hard training and competitions.

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我们花了三天时间才完成这项艰苦的任务。

It took us three days to accomplish this tough task.

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我们花了三天的时间来完成这个艰苦的任务。

It took us three days to finish this tough task.

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但是他承认这将会是一个非常艰苦的任务。

But he admitted it would be a very tough task.

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但是他承认这将会是一个非常艰苦的任务。

But he admitted it would be a very tough task.

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