当然，我认为卡特林北极考察队的确是了不起的。
Of course, I think that the Catlin Arctic explorers are truly remarkable.
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 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 attend on their scientific expedition to the North Pole.
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