问答题

In practice, this is an advantage to the aeroplane, which is already at a good height when it reaches the polar region and so does not to climb, while at the same time cold air keeps the clouds down low. (Passage 1 )

【参考答案】

实践中，这对飞机有利，因为当它到达北极时不用爬升就已经处于一个很好的高度了，同时，冷空气也使云层降低。

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