What most people don't know is that the sport of rock climbing is one of the most physically and mentally demanding sports there is.
人们最不了解的是，攀岩这种运动是最有身体和智力要求的运动之一。
Rock climbing is a physically and mentally demanding sport, one that often tests a climber's strength, endurance, agility and balance along with his mental control.
攀岩是一个对身体和精神都有考验的运动，往往考验登山者的力量、耐力、灵敏性和平衡能力，当然还有对自我的精神控制能力。
Those who had held mentally stimulating, demanding jobs before retirement tended to do the best on the tests.
那些在退休前从事过精神刺激、要求高的工作的人在测试中表现最好。
The researchers believe that living in a group is more demanding mentally than having a lonely existence.
研究者认为，群居型的动物比独处型的动物需要更多的脑力活动。
Graduate school is highly demanding, both mentally and physically.
研究生学习在心理和身体上都要求很高。
The Premier League is so demanding on your body, and mentally as well, so it's tough when it comes to summer to motivate yourself again.
英超十分体能，还有精神的要求很高，所以夏天你很难再提起干劲。
The Premier League is so demanding on your body, and mentally as well, so it's tough when it comes to summer to motivate yourself again.
英超十分体能，还有精神的要求很高，所以夏天你很难再提起干劲。
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