昨天发生了一场大地震。
zuótiān fāshēng leyī cháng dà dìzhèn 。
A major earthquake occurred yesterday.
地震后，人们都很害怕。
dìzhèn hòu ， rénmén dūhěn hàipà 。
After the earthquake, people were very scared.
科学家正在研究地震的原因。
kēxué jiā zhèngzài yánjiū dìzhèn de yuányīn 。
Scientists are studying the causes of earthquakes.