常見例句Retroengine's firing time must the accuracy control, the firing time differ 1 second, will cause the airship point of descent position difference kilometer. 制動發(fā)動機的點火時間必須精確控制，點火時間相差1秒鍾，就會使飛船落點位置相差數(shù)公裡。 返回 retroengine