There were a lot of wars in our history. 历史上曾发生过很多次战争。

　　People make wars to get something. 人们为了得到某些东西而发动战争。

　　In the old days, some countries invaded other countries to expand their lands. 在古代，一些国家为了拓展领土而侵略其他国家。

　　During war, a lot of people die and many buildings are destroyed. 战争期间，无数人丧命，大片建筑被毁。

　　Sometimes families are separated. 有时家人骨肉分离。

　　The oldest war in history happened more than 5000 years ago. 历史上最早的战争发生在5000多年前。