灾难
Earthquakes are caused by forces deep within the earth.地震是由地球深处的力量引起的。
When the earth shakes, buildings can collapse and people can be buried inside.当地震发生时，建筑物会倒塌，人们会被埋在里面。
An explosion is a rapid, violent release of energy.爆炸是一种迅速而猛烈的能量释放。
Explosions can be caused by chemical reaction, such as inside an engine.爆炸可以由化学反应引起，例如在发动机内部。
A spark can ignite a mixture of gases and release energy for good or destructive purposes.星火可以点燃混合气体，释放出有益的和具有破坏性的能量。
Accidents are often caused by people doing foolish things or by not being careful.事故往往是由于人们做傻事或不小心造成的。
One major cause of accidents is driving too fast.交通事故的一个主要原因是开车太快。
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，并可能导致非常痛苦的伤害。
Epidemics are the rapid spread of a disease such as the flu or ebola.流行病是一种疾病的迅速传播，如流感或埃博拉。
Throughout history epidemics have killed millions of people.纵观历史，流行病夺去了数百万人的生命。
Storms are caused by changes in the atmosphere resulting in high winds and heavy rain.暴风雨是由大气的变化引起的，造成强风和大雨。
Thunderstorms are caused by electric charges in the atmosphere that produce lightning, which can cause forest fires.雷暴是由大气中产生闪电的电荷引起的，闪电能引起森林火灾。
Some storms cause flooding, and major damage to homes and cities.一些风暴导致洪水泛滥，对房屋和城市造成重大破坏。
Many forest fires are caused by lightning.许多森林火灾是由照明引起的。
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