Often, scientists see large chunks drifting in polar seas, and then have to work backwards to figure out the point of origin.

通常来说，科学家们都是先观测到极地洋面漂浮着大面积冰块，之后再追溯它原始的形成过程。

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Sailors must take care when traveling through iceberg-filled waters, and ships that sail in polar seas usually have a specially made hull so that they are very strong.

在多冰山的水域航行时，船员们必须非常小心。经常穿梭于两极海域的船只往往有着特殊的船体，异常坚固。

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Climate change has already had documented effects on species living across the globe, from polar bears in the Arctic to coral reefs in the tropical seas.

从北冰洋的极地熊到热带海域的珊瑚礁，气候变化已经被证明对全球范围内的生物都产生了影响。

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