这次探险的艰难程度让最有经验的队员都感到震惊。
The ___arduousness of the expedition stunned even the most seasoned members.
她低估了攀登那座山峰的艰难程度。
She underestimated the ___arduousness of climbing that mountain.
这项任务的艰难程度在最初的几天里就变得十分明显。
The ___arduousness of the task became apparent within the first few days.
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