这是一项艰巨的任务。
Hes not fit to tackle such an arduous task.
他的病刚好，所以还不适宜走长路。
Writing is an arduous task to complete in English teaching.
在英语教学中，英文写作是一个比较难解决的问题。
Therefore, the protection and improvement of water environment became an urgent and arduous task.
因此保护、改善水环境成为一项紧迫而又艰巨的任务。
Therefore, the protection and improvement of water environment became an urgent and arduous task.
因此保护、改善水环境成为一项紧迫而又艰巨的任务。
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