And the difficulty was basically the problem of duplication.
提出了一个难题，这难题就基于复制。
They have knocked over every difficulty and solved that technical problem.
他们已排除种种困难，解决了那个技术问题。
The difficulty and central problem of machine thinking are machine creativity.
机器思维的难点和核心是机器创造性思维。
The difficulty and central problem of machine thinking are machine creativity.
机器思维的难点和核心是机器创造性思维。
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