In practice, this could be hard to achieve, but he has identified one principle. Central Banks' credibility should be focused where it is most needed, on controlling inflation.
2
这一节讨论控制模式演化的实际问题，并提供出一组用于编写跨模式版本查询的指导原则。
In this section, we'll discuss practical issues involved in controlling schema evolution and present a compact set of guidelines for writing queries across schema versions.
3
从严格控制的实验室研究得到的一般原则，常常难以解决实际问题。
General principles from rigidly controlled laboratory studies often become clogged in solving practical problems.
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