The Puffin may never fly, but other inventors are tinkering.

也许海雀还不能飞，但其他的发明家仍在努力。

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This may be true. But too many policymakers never even “fly” their models.

这也许很有道理，但现在的问题是我们太多的决策者对他们采用的模型一点都不了解，而只想知道模型最后的结论是什么。

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Trying to tackle all 30 problems at once is like those little bugs that fly around in all directions, never making any real progress but stirring up a lot of motion.

试着一次解决全部30个问题就像往各个方向飞的小虫子，做了很多功却永远不会取得实际的进展。

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Test pilots demonstrated that it could fly and land in the atmosphere like airplanes, but the Enterprise never flew in space.

CNN: Space shuttle Enterprise flies again

But other local currencies have never really taken off, so can the Bristol scheme really fly?

BBC: Bristol Pound launched to keep trade in the city