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When a crash landing happens, some passengers especially the old and children may fear to jump down from the hatch to the slide, but the special structure of V plus emergency slide enables all the passengers to overcome their fear to some degree. For the ordinary people, it doesn’t matter if they fail to jump to the upper slide because they will fall into the lower slide. For children, the pregnant and the old, the upper slide provides them with a shelter so they won’t be afraid to slide down from the lower one. As a result, it will improve the escaping efficiency and make contribution to reducing casualties.