Paying into the public scheme should, in theory, mean that foreigners get something back. But in practice, that may be tricky.

从理论上来看，参与公共计划意味着外籍人士会有所得，但是实际上，这可能会有猫腻。

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But, as Splashpower found, turning the theory into profitable practice is not straightforward.

但是，就像Splashpower一样，要把理论转化为可盈利的实际产品并不那么顺利。

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This article went into the theory, and practice of working with Erlang, but there is much, much more to learn.

本文讨论了使用Erlang的理论和实践，但是还有很多东西要学习。

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But putting theory into practice is not easy: Cloning Dolly required 277 attempts.

CNN: 'Raelian' biochemist insists she will clone human

But putting the theory into practice may be some way off.

BBC: 3D printers could use Moon rocks, say scientists

Theory is splendid but until put into practice, it is valueless.

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