Ultimately, any good policy, whether for good times or "bad" times, should be based on the same sound principles.
最终，不管是在好年代还是“坏”年景，任何好政策都应该建立在同样良好的原则基础之上。
It argues that charging policy, based on marginal cost pricing, is economically efficient, and facts show that relevant principles are more widely accepted by airport operators.
利用边际成本定价模式确定飞机所需交纳的起降费从经济学角度来说是富于效率的，并且相关的原则也为越来越多的机场所采纳。
Our policy is based on a few simple principles.
我们的政策基于几个简单的原则。
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