环绕地球飞行的最佳时节是六月到八月，而这段时间早已过去了。

The best weather for flying around the world is from June to August. That time was far past.

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现在专家期待着观察彗星在环绕灼热太阳飞行之后会发生怎样的变化。

Now space experts want to see how the comet has changed after its tour around the scorching sun.

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不着陆加油地环绕世界飞行被称为是终极的飞机记录，这一直以来被认为是不可能的。

A non-stop flight around the world without re-fueling was the last flight record to be set. The flight always had been considered impossible.

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