北极燕鸥是真正的长途迁徙者，它们在北欧沿海湿地筑巢，但会向南飞行数千英里，在南极洲度过欧洲的冬季。
Arctic terns, being true long-distance migrants, they nest in coastal wetlands of northern Europe but fly south for thousands of miles to spend the European winters in Antarctica.
它们将这些垃圾场作为冬季的进食地点，而非飞行数千英里去寻找食物。
Instead of flying thousands of miles in search of food, they make the waste sites their winter feeding grounds.
因此，任何冬季里，行动力和思维力的渐趋缓慢都是必须的。
Thus the gradual slowing of activity and thought during any winter season is necessary.
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