It is a story of scientific expedition.
这是一个科学探险的故事。
Many difficulties attend on their scientific expedition to the North Pole.
他们去北极进行科学考察碰到了许多困难。
Many difficulties attended on their scientific expedition to the North Pole.
他们去北极进行科学考察碰到了许多困难。
Many difficulties attended on their scientific expedition to the North Pole.
他们去北极进行科学考察碰到了许多困难。
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