原则上讲，所有的acts_as插件工作原理相同。
In principle, all acts_as plug-ins work the same way. You always follow these steps to build an acts_as module.
阿喷气发动机的工作原理有一个平等，相反重新行动的艾萨克牛顿第三定律的物理，即每一个行动的原则。
A jet engine works on the principle of Sir Isaac Newton's third law of physics, i. e. for every action there is an equal and opposite re-action.
介绍了各种空压机的分类和工作原理及其性能特点和空压机的选用原则。并且讨论了如何确定空压机的流量和压力。
Classification, work principle and performance of various air compressor, choice principle of air compressor are introduced in the paper. And how to determine flux and pressure is discussed.
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