What used to be considered impossible has now turned into realities.

过去被认为不可能的事情现在都变成了现实。

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All the new research says is that life on such worlds can no longer be considered impossible.

所有的新研究表明，这样世界上的生命不能被认为是不可能的了。

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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.

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。

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Reasoning together to solve problems should never be considered impossible in America.

CNN: Three areas where Biden and NRA can find common ground

For many years, the 4 minute mile was considered to be an impossible feat.

FORBES: The Four Minute Malware: Aurora, Stuxnet, and Beyond

Ms Deech said that while international agreements to stamp out the worst ethical excesses would be desirable, implementing them would be "impossible", not least because different countries did have discernable differences in what is considered acceptable.

BBC: Halting the fertility 'fraudsters'