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。
youdao
It must have been a very arduous task to build the pyramids.
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。
"Neighbours had thrown him a line to keep him above the surface until we got there, but conditions were very arduous, " he said.
BBC: Teenage boy rescued from sinking sand outside Derry
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