三言
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1. The cause of natural disasters is the behaviour of human beings.
2. Disaster Day is aiming at proposing everyone to stop doing the things that will cause natural disasters.
3. Natural disasters have caused serious tragedy, leaving plenty of people hurt or died.
1. 灾难对经济和社会的可持续发展有着严重的影响，威胁到人类的生存。
Disasters have a great influence on the sustainable development of economy and society and threatens the survival of mankind.
2. 自然灾害是当今世界必须面临的最大问题之一。
Natural disasters are one of the biggest problems (that) the current world has to face.
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