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5.Lack of Oxygen 缺乏氧气: Through training, people have been able to hold their breath for up to 11 minutes. An untrained person will typically pass out within 2 minutes. 通过培训，人们能够屏住呼吸长达11分钟之久。未经训练的人一般会在2分钟以内。 6. Diving Deep 潜入深水: 282 feet has been achieved by the best free diver. An ordinary person is most likely to black out below 60 feet and before 2 minutes without equipment. 最好的自由的跳水运动员已经能达到282英尺。一个普通人在没有任何装备辅助的情况下最多可以到达60英尺，耐久2分钟。 7. Blood Loss失血: Spilling 40 percent of your body's blood would require an immediate transfusion. You can survive without intervention if you lose 30 percent. 你体内流失掉40%的血液需要就立即输血。如果你损失了30%，没有任何干预的话，你是能够存活的。 8. Starvation饥饿: You can survive for nearly 45 days without food. However, lose 30 percent of your body weight and death is imminent. Disease will likely kill you before you starve, due to your body's weakened state. 没有食物你可以生存近45天。然而，损失了30%的体重意味着死亡即将到来。由于身体虚弱，疾病会在你挨饿之前将你彻底击垮。 9. Dehydration脱水: Surviving more than 7 days is highly unlikely if you don't replace a quarter or so of water you lose daily. This is because every cell in our body needs water to properly function. | 
