Retroengine's firing time must the accuracy control, the firing time differ 1 second, will cause the airship point of descent position difference kilometer.
制动发动机的点火时
必须精确控制，点火时
1秒钟，就会使飞船
点位置数公
。
Retroengine's firing time must the accuracy control, the firing time differ 1 second, will cause the airship point of descent position difference kilometer.
制动发动机的点火时必须精确控制，点火时1秒钟，就会使飞船点位置数公。
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