问题描述：
Lesson 43 Over the South Pole 飞越南极 In 1929,three years after his flight over the North Pole,t
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这句话我很不理解,请帮我详细讲解,语法等难点.
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这句话我很不理解,请帮我详细讲解,语法等难点.
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