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本文介绍的是能使弹射气体在密封环周围的某个区域旁通的装置和方法。该密封环安装在导弹后端与发射筒之间，可对导弹后端提供一个定心力，以确保导弹发射期间稳定筒内弹道。
This article describes devices and methods that bypass the ejector gas in a certain area around the seal ring. The seal ring, mounted between the rear of the missile and the launch tube, provides a centering force to the rear of the missile to ensure stable barrel trajectory during missile launch.