该理论指出，在一个较长的时间段内，任何两国之间的汇率应该朝着某一方向移动，从而使得在两国购买等量的货物和服务的价格相等。
This says that, in the long run, exchange rates should move toward rates that would equalise the prices of an identical basket of goods and services in any two countries.
不过，他们也指出，该套理论仍然处于概念化的早期阶段，在他们懂得如何去将它精确化之前，还有很长的一段路要走。
However, they note that the theory is still in the early conceptual stages, and has a long way to go before they know how accurate it is.
针对我国现行轻型汽车燃料消耗量试验方法，运用汽车工程理论进行了有关计算分析，指出该方法存在的不足。
By calculation and analysis being relative to fuel economy in automobile engineering theory, some shortages of measurement methods of fuel consumption for light-duty vehicles in use are indicated.
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