Scientists aren't exactly sure what causes the brain freeze when we eat ice cream or other super cold foods too quickly, though some believe it's the result of changed blood.
They have hinted at strange survivals in terms which would freeze the blood if not masked by a bland optimism.
他们同时暗示道，某些特殊的残存者——如果不是被盲目的乐观主义所掩藏的话——据说可以冷却自身血液。
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The fish have proteins in their blood that protect them from frost. That's been long known, but scientists never understood how these anti-freeze proteins worked.