0 extremely tiring and difficult, and demanding great effort and determination -- 使人精疲力盡的；艱辛的；讓人受不了的
Indeed, computer-based instruments, while requiring a gruelling practice to be mastered, can also be easily approached and help reveal one's inherent musicianship.
By the 1830s, however, the solitude of walking was replaced by the gruelling competitive sports of rowing and, subsequently, rugby.
Many of the workers who put in long hours in gruelling circumstances were local authority employees.
They have been under a heavy strain and have had a gruelling time.
He would not attend when he saw the gruelling work that had to be done.
After six gruelling years, the sense of relief was universal.
Because of them, the discussion was very gruelling, because they thought that we would overlook their products.
They have had, as all of us are aware, a very gruelling summer.
