arduous
单词辨析：
指因需要努力或技巧而难以做成、理解或处理的。
Moving that huge stone was difficult.
移动那块大石头很费劲。
The poem is difficult to read.
这首诗很难读懂。
The entrance exam of that school was not difficult.
那所学校的入学考试不难。
尤指在一段时间内需耗费大量体力和精力才能完成的。
The arduous task is of great challenge to him.
这项艰巨的工作对他是个很大的挑战。
All the 6 adventurers survived the arduous journey through the desert.
6名探险家都完成了穿越沙漠的艰难旅程。
指事情不好理解、处理或不容易做的。
He found that it is hard to learn English well.
他发现学好英语很难。
It's hard to say which is right.
很难说哪一个是正确的。
More practice will make us a hard team to beat.
多加练习，我们就能成为一支难以战胜的球队。
因存在或将会引发问题等而难以完成或处理的，尤指在情感上难以抉择的。
His company survived a tough year.
他的公司挺过了艰难的一年。
Those tough questions really embarrassed him.
那些难以回答的问题的确让他很难堪。
相关例句：
No matter how arduous the task is, we finished it as well.
无论任务多么艰巨，我们也要把它完成。
In next arduous two years, I don't know how many things I will learn.
在接下来艰苦的两年中，我不知道我还要学多少东西。
She undertook the arduous task of monitoring the elections.
她承担了监督选举的艰巨任务。
To remould one's world outlook involves arduous struggle.
改造世界观需要进行艰苦的斗争。
In the near future they can complete this arduous task.
在不久的将来，他们就可以完成这项艰巨的任务。
We must persevere in the arduous work.
我们一定要坚持这项艰苦的工作。