In 1929,three years after his flight over the North Pole,the American explorer,R.E.Byrd,successfully flew over the South Pole for the first time.为什么第一个用flight,第二个用flew.

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In 1929,three years after his flight over the North Pole,the American explorer,
R.E.Byrd,successfully flew over the South Pole for the first time.为什么第一个用flight,第二个用flew.

第一个是名词,第二个是动词过去式.前半个句子是个短语,不需要动词.