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?

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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?
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?

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?
for the first time是一个固定的短语,表示“第一次(做某事)”