It must have been a very arduous task to build the pyramid.
当时建造金字塔肯定是件万分艰巨的事。
It must have been a very arduous task to build the pyramids.
当时建造金字塔肯定是件万分艰巨的事。
Because construction work can be very arduous, few people want that kind of job.
因为建筑工作会很辛苦，所以很少人想从事这种行业。
They are very glad that they have been assigned the most arduous task .
他们很高兴被派给最艰巨的任务。
The tasks to set up the HSE management system are very complicated and arduous.
建立HSE管理体系是一项复杂和艰巨的工作。
The tasks to set up the HSE management system are very complicated and arduous.
建立HSE管理体系是一项复杂和艰巨的工作。
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