北极冰盖随季节而变化，在严寒的冬季增长而在夏季则会减少。
The Arctic ice cap fluctuates with the seasons, growing in the freezing winter and shrinking over the summer.
而在夏季，因为疲劳感减轻和皮肤晒黑，黑眼圈就比较容易遮掩。
In the summer dark circles are easier to hide as people suffer less from fatigue and the skin is lightly tanned.
这一现象造成的后果是：在春季，河水流速变快，增加洪水发生的危险；而在夏季，河水流速变慢，即有可能出现旱灾。
The result is that rivers are flowing faster in the spring, raising the risk of flooding, and slower in the summer, raising the risk of drought.
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