由于AIX内存优化，这常常是个难以完成的任务。

This is often a hard task, due to AIX optimization of memory.

youdao

这是一个我乐意给人们展示的领域，因为我们所作的工作将以前难以完成的任务简化为非常简单的操作。

This is an area that I love to show people, because the work we have done reduces a formerly-tricky task down to a few clicks.

youdao

她觉得难以完成给自己定下的任务。

She felt unequal to the task she had set herself.

《牛津词典》