successfully flew over the South pole for the first time.开头的successfully为什么用ly形式,是什么用法

successfully flew over the South pole for the first time.开头的successfully为什么用ly形式,是什么用法 flew 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. the explorer successfully flew over the South Pole for the first time.为什么用for?为什么在the first time前面用for?for做什么解? 新概念英语2册43课第一句话.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.我有俩个问题：1.successfully flew over the South Pole for the over的词性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.his flight over the North Pole这个over应该是动词吧,successfully flew over the South °|OvЁr.、 ov文件是什么 successfully是什么意思? successfully是什么意思 英语标点符号问题In 1929,the American explorer,successfully flew over the South Pole for the first time.请问这句话能把逗号去掉么?为什么?如果必须去掉,并且保持愿意不变,请问应该改成什么样子? flew around flew是什么意思? flew 是什么意思 free flew flight over the north poleIn 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.这个句子中flight over the North Pole和flew over the South Pole 的区别 电工符号中-ov是什么意思 il--ov--补全单词.