Earthquakes are caused by forces deep within the Earth地震是由地球深处的力量导致的
With the Earth shakes，buildings can collapse and people can be buried inside由于地球的晃动 建筑物倒塌人们被埋在里面
An explosion is a rapid，violent release of energy爆炸发生很快 能量猛烈的释放
Explosions can be caused by chemical reaction，such as inside an engine 爆炸可以由化学反应引起的，例如发动机内部
A spark can ignite a mixture of gases and release energy for good and destructive purpose 火花可以点燃混合气体，并释放能量，达到良好的和破坏目的
Accidents are often caused by people doing foolish things or by not being careful事故通常是人们做了愚蠢的事或不小心 导致的
One major cause of accidents is driving too fast 事故的一个主要原因是驾驶的太快
Accidents with fire can be very serious and can result in very painful injuries火灾事故可能是非常严重的我，可能导致非常痛苦的伤害
Epidemics are the rapid spread of disease，such as the flu or Ebola传染病是传播的很快的疾病例如流感或埃博拉
Throughout history ，epidemics have killed millions of people贯穿历史传染病已造成百万的人死亡
Storms are caused by changes in the atmosphere，resulting in high winds and heavy rain 暴风雨是大气层的变化引起的大风暴雨
Thunderstorm are caused by electric charges in the atmosphere that produce lightning，which can cause the forest fires雷暴是大气层中产生雷电的电荷，闪电能引起森林火灾
Some storms are caused flooding，and major damage to homes and cities一些风暴导致洪水泛滥，对房屋和诚市造成重大的损坏
Many forest fires are caused by lightning许多森林火灾是由雷电导致的
Accidents are often caused by people doing foolish things or by not being careful事故通常是人们做了愚蠢的事或不小心引起的
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