其次，针对摆动活塞式发动机的总体结构进行设计。
Next, in view of swings the piston engine overall structure to carry on the design.
IVB级有一个单独摆动发动机来作俯仰和偏航。
The S-IVB stage has its single engine gimbaled in pitch and yaw.
首先，针对摆动发动机的工作原理进行设计与分析。
First, the author aims at the swings engine principle of work to analysis and design.
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