Electric toothbeushes seemd impossible a hundred years ago.打错了,改为复合句

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Electric toothbeushes seemd impossible a hundred years ago.打错了,改为复合句
Electric toothbeushes seemd impossible a hundred years ago.
打错了,改为复合句

Electric toothbeushes seemd impossible a hundred years ago.打错了,改为复合句
It seemd impossible that electric tooth be used a hundred years ago.