对于面向图形用户界面的商业操作系统养育出来的用户，换用开源POSIX类的操作系统可能是一项困难重重的任务。

For users reared on GUI-oriented commercial operating systems, switching to open source POSIX-type OSes can be an onerous task.

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对于困难重重的阿富汗来说，同样的任务能够完成吗？

Can the same be done for the troubled mission in Afghanistan?

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尽管困难重重，但是我们的任务已经顺利完成。

In spite of the difficulties, our task was got over well.

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