a gruelling climb的用法和样例：
- a gruelling climb, race, trial, ordeal, etc
使人筋疲力竭的攀登﹑ 竞赛﹑ 审讯﹑ 考验等.
- Mr Suwaidi's unexpected modesty comes after a gruelling few years.
- There was a steep climb on the road out of town.
- It was a gruelling childhood and, later in life, Astaire would just say that he didn't want to talk about it.