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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也许阿爸真的很开心，也许阿爸不想再纠结过去。毕竟天一亮要干活，地要种，钱要挣，孩子要养，老人要顾。哪一样都比“想一想从前”更要紧。