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。
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Yet, the little bee gets those wings going like a turbo-jet and flies to every plant its chubby little body can land on to collect all the nectar it can hold.
但是，这种小蜜蜂却像涡轮喷气飞机一样地展翅飞行，飞到它圆乎乎的身体能够降落的任何植物上去采蜜。
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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.