let sum of weights = 0.0
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。。51吃瓜对此有专业解读
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If robots are to become more sophisticated, they will have to have more efficient, more precise and more intelligent actuators.