这些稀有的造物叫雪卷，大自然全凭一己之力创造了它们，当湿雪落在多冰的地面并且不黏附于地面时，雪卷才有可能产生，强风吹动地面上的湿雪，滚动后便形成了雪卷。
These rare creations are called snow rollers, and Mother Nature makes them all by herself. Snow rollers form when wet snow falls on ground that is icy, so snow won't stick to it.
例如南极海冰并没有缩小，大概是因为多融化的冰和多下的雪持平。
Antarctic sea ice, for instance, does not seem to be shrinking, probably because increased melting is balanced by more snow.
那里降下的雪比蒸发的多，使冰可以逐渐累积。
More snow falls there than evaporates, leading to a net accumulation of ice.
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