10.从从容容、游刃有余，匆匆忙忙、连滚带爬
He identified creating a hand as one of the three most difficult problems facing makers of humanoid robotics. The other two were creating an artificial intelligence that allowed the robot to comprehend the world, and making robots in large numbers.
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swap(&arr[i], &arr[largest]);
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Source: Computational Materials Science, Volume 267