正在消失的海洋冰块儿正在使这个任务更加容易。

Disappearing sea ice is making that task easier.

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山脉起起落落需要数千万年；而海洋出现与消失的速度甚至远比山脉起落要缓慢。

Mountains rise and fall over tens of millions of years; oceans open and close at rates even slower than that.

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科学家警告，夏天海洋冰面的消失会造成非常严重的损害。

Disappearing summer sea ice poses considerable dangers, scientists have warned.

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