characterized by effort to the point of exhaustion; especially physical effort;
"worked their arduous way up the mining valley"
"a grueling campaign"
"hard labor"
"heavy work"
"heavy going"
"spent many laborious hours on the project"
"set a punishing pace"
gruelling的用法和樣例：
例句
用作形容詞 (adj.)
To get a state licence, MSBs have to go through a gruelling vetting process. 為了得到州內執照，現金回款企業必須通過一段另人精疲力竭的審查過程。
形容词
經典引文
Lendl's training programme is so gruelling that few people could keep up with it.
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