While we invoke the precautionary principle, which always recommends erring on the side of caution, we have to recognize there will be trade-offs to be made.

当我们援引总是建议谨慎行事的预防原则时，我们必须做出权衡。

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If the Doha round collapses, regionalism, despite its unarguable economic inferiority, will replace multilateralism as the organising principle of global trade.

如果多哈回合谈判破裂，那么区域主义将取代多边主义成为全球贸易谈判的组织原则，尽管区域主义在经济上的劣势毫无争议。

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If your current lifestyle is not in alignment with these principles, then you might trade a value-based map for a principle-centered compass.

如果你现在的生活方式和这些原则不相符，你可能用的是一张价值取向的地图，却拿着一个原则为本的方向盘。

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As magic is all about secrets, you might expect magicians' tricks would gain protection under the principle of trade secrets - this is how Coca-Cola guards its recipe and how KFC protects the spices it uses on its chicken, for example.

BBC: The magicians who rip off other conjurers' tricks

Plus, you have the fact that the remaining presidential candidates all support the cap-and-trade principle.

FORBES: Magazine Article

Mr Sadr agreed in principle last month to trade armed insurgency for peaceful party politics.

ECONOMIST: Is a partial election really better than none?