Travel was arduous and costly throughout the period, possible only for a privileged class—the same that produced gentlemen scientists, authors, antique experts, and patrons of the arts.

这整个时期里的旅行是艰辛、昂贵的，可能只有享有特权的阶级才能旅行，同样也是这个阶级造就了有教养的科学家、作家、古董专家和艺术赞助人。

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Most goods were transported along the paths that provide short-cuts up and down the hillsides, but the paths were a real safety risk and made the journey on foot even more arduous.

大多数货物都是沿着山路运输的，这条路提供了上下坡的捷径，但这些路确实存在安全隐患，让徒步旅行更加艰难。

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This is a hard job.; The task is arduous.

这个任务很吃重。

《新英汉大辞典》

Speaking to a packed chamber at Stormont, the Northern Ireland Assembly, Hillary Clinton praised lawmakers for progress made in a long and often arduous peace process.

VOA: standard.2009.10.12

And after a long and arduous journey navigating a country they don't know, a language they don't speak and with meager funds, they made it to Ankara, the Turkish capital, where they are now waiting.

CNN: Young Syrian amputee makes dangerous journey to find help

Jury selection can be a long arduous process of selecting members from a larger pool, questioning of the jurors on their own background (nothing too probing) and whether they think they have any biases that would impact the case (previously being duped by a stock broker might get one out of serving in this trial).

FORBES: Rajaratnam Jury Selection -- This Is Going To Get Complicated

Arguably, the life of a mill child in Lancashire was no less arduous than that of a slave on the cotton plantations in America.

ECONOMIST: Cotton