arduous

adj. /ˈɑːrdʒuəs/ C2

艰巨的；费力的

Involving a lot of effort and energy; very difficult.

仙境例句

Carrying the long ladders through the town was arduous work for little Bill.

扛着长梯子穿过小镇，对小小的比尔来说是件艰苦的活儿。