Level 4 - Unit 2 - Part 2 Vocabu

Earthquakes are caused by forces deep within the earth. When the earth shakes, buildings can collapse and people can be buried inside.
地震源自地球内部深处的力，当地震发生时，建筑物会倒塌，人们会被掩埋在里面。

An explosion is a rapid, violent release of energy. Explosions can be caused by chemical reaction, such as inside an engine. A spark can ignite a mixture of gases and release energy for good and destructive purposes.
爆炸是一种快速而猛烈的能量释放，爆炸可以由化学反应引起，例如在发动机内部。火星可以点燃混合气体，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. One major cause of accidents is driving too fast. Accidents with fire can be very serious and can result in very painful injuries.
事故往往是由于人们做傻事或不小心造成的。交通事故的一个主要原因是开车太快，火灾事故可能非常严重，并导致非常痛苦的伤害。

Epidemics are the rapid spread of a disease such as the flu or ebola. Throughout history epidemics have killed millions of people.
传染病是一种快速传播的疾病，如流感或埃博拉。回顾历史，传染病已经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. Thunderstorms are caused by electric charges in the atmosphere that produce lightning, which can cause forest fires. Some storms cause flooding and major damage to homes and cities.
暴风雨是由大气的变化引起的，造成强风和暴雨。雷暴是由大气发生闪电时的电荷引起的，可以引发森林火灾。有些暴风雨导致洪水泛滥，对房屋和城市造成重大破坏。