Retroengine's firing time must the accuracy control, the firing time differ 1 second, will cause the airship point of descent position difference kilometer.
发机的点火时间必须精确控，点火时间相
1秒钟，就会使飞船落点位置相数公里。
Retroengine's firing time must the accuracy control, the firing time differ 1 second, will cause the airship point of descent position difference kilometer.
发机的点火时间必须精确控，点火时间相1秒钟，就会使飞船落点位置相数公里。
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