Innovation in aviation has centered on the development of the jet engine for civil use, first in a turbo propeller form and later as a pure jet.
航空业的革新集中于民用航空喷气式发动机的研发，首先是涡轮螺旋桨发动机，后来是纯粹的喷气机。
It serves to replace or complement the propeller, wheel, jet engine, solid fuel, etc, in the area of transportation and use in space travel.
它在运输和太空旅行应用领域中，用来取代或补充推进器、轮盘、喷气发动机、固体燃料等。
It will be noted that the emphasis in this book is on the turbo-jet engine and that no special part deals with the propeller-turbine engine.
应该指出，强调在这本书是关于在涡轮喷气发动机，并没有特殊的部分涉及与螺旋桨涡轮发动机。
It will be noted that the emphasis in this book is on the turbo-jet engine and that no special part deals with the propeller-turbine engine.
应该指出，强调在这本书是关于在涡轮喷气发动机，并没有特殊的部分涉及与螺旋桨涡轮发动机。
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