Second , clinical trials are arduous .

第二，临床试验过程艰巨而漫长。

Finding that special someone can be both an arduous and lengthy task .

找到那个特别的人是一项艰巨而漫长的任务。

Yet mastering these arduous skills is at the very essence of achievement .

然而，精通这些艰巨技能是获得成功的最关键要素。

Their desperate journey over the floes must surely rank as one of the most miserable and arduous polar slogs ever attempted .

他们在浮冰上的绝望旅程，肯定是史上最为悲惨和艰巨的极地跋涉之一。

Equally investors could declare this a breach of contract and sue for damages , but this would be a lengthy and arduous process .

投资者同样可能宣称这违反了合约，起诉要求损害赔偿，但这将是一个漫长而艰巨的过程。