But to understand exactly how climate change is affecting the polar regions, the thickness of the ice needs to be known too.
但是，要准确了解季节的变化怎样影响极地地区，同时还要知道冰的厚度。
Ittranspires that these are an uncommon set ofparameters in the polar regions, especially when your destination is a partially prepared landing area on sea ice of an unknown thickness.
北极区总是存在很多未知参数，尤其是当你降落的目的地是一片厚度未知的冰面。
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