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Lately,many people are suffering damage fromnatural disasters.
Almost no preventive action is taken even though more serious damages occur due to the aftermath of earthquakes in China, Chile, and Haiti.
Earthquakes can happen anywhere at anytime and they cause a lot of damage. Especially, those who live in tall buildings are likely to suffer serious damages.
When earthquakes occur, people need to avoid using elevators and escape through emergency stairs. But in tall buildings, there is not enough time for this.
Therefore, an effective emergency exit is necessary in order to avoid life-threatening injuries during evacuation.