In fact, to learn with success is not a very difficult task if you follow some basic rules.

事实上，如果你遵循一些基本的规则，成功地学习并不是一件非常困难的事情。

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Sometimes this is a very difficult task.

有时这是一项非常困难的任务。

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Buying a new laptop can be a very difficult task.

买台新的笔记本是一件不容易的事。

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Persuading Saudi Arabia to permit such a forward deployment for the purpose of fighting another Arab state was a very difficult task.

CENTERFORSECURITYPOLICY: Center For Security Policy

It's a very difficult task, but you don't do things inappropriately.

NPR: Latest NCAA Scandal Comes From Headquarters

And I also want to recognize the members of the prize jury, who I think have a very difficult task in choosing from so many outstanding architects all around the world.

WHITEHOUSE: The Pritzker Architecture Prize