As with any radical change to an existing technology, especially a jet engine, a large installed base of expertise together with lots of regulation mean it can be hard for a newcomer to make headway.
因为对于一个已存在技术的根本性的改变，尤其是对飞机引擎来说，大规模基础的专业知识和数量繁多的规章制度使得新来者很难取得进展。
It should be noted that the rate of gas engine heat pump is limited regulation, and can not be any regulation, which is the work of the engine and compressor characteristics.
需要指出的是，燃气机热泵的速度调节是有限制的，并不能任意调节，这与发动机和压缩机的工作特性有关。
The regulation that the engine of a few searches that I sum up optimizes is below.
下面是我总结的一些搜索引擎优化的规则。
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