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。
Jet planes have displaced propeller ones.
喷气式飞机取代了螺旋桨飞机。
This paper discusses the effects of air jet in the leading edge of propeller on its hydrodynamics and radial noise.
讨论了螺旋桨导边充气对其水动力性能和辐射噪声的影响。
Then the mechanism analysis of the planetary gear train propulsion that is the main part of the water-jet propeller is carried out.
然后，对推进器的主要部分——行星轮系推进装置进行机构分析。
Then the mechanism analysis of the planetary gear train propulsion that is the main part of the water-jet propeller is carried out.
然后，对推进器的主要部分——行星轮系推进装置进行机构分析。
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