A policy defines a particular capability or constraint.

策略定义特定的功能或约束。

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And then you can go back and find the next leverage point, or constraint.

然后，你就回头找下一个杠杆点，或制约因素。

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For example, the definition or constraint that a postal code must be a valid number may be missing or not enforced consistently.

例如，可能缺少邮政编码必须为有效数字的定义或约束，或者执行不一致。

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Our constraint is going to be an adiabatic expansion or compression.

现在约束改成了,绝热膨胀，或者压缩。

麻省理工公开课 - 热力学与动力学课程节选

And a traditional bond fund simply lacks that constraint or lacks the flexibility.

FORBES: What Is a "Flexible" Bond Fund?

Yankowski asserted that he didn't believe the recent U.K. auction of five 3G licenses would wind up becoming a hidden tax on the consumer, or even a constraint on competition.

CNN: Palm, Psion see affordable 3G wireless coming

Whether we can do so may turn on whether the binding constraint comes from regulation or from the market.

BBC: The Bank's push to ease credit