some years later robots can walk with two legs.改为否定句

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someyearslaterrobotscanwalkwithtwolegs.改为否定句someyearslaterrobotscanwalkwithtwolegs.改为否定句someyearslat

some years later robots can walk with two legs.改为否定句
some years later robots can walk with two legs.改为否定句

some years later robots can walk with two legs.改为否定句
some years later robots can't walk with two legs.