Why do people cooperate with other people? 人们为什么要与他人合作？

　　They cooperate with others to make things easier and faster. 人们合作是为了使事情变得简单快速。

　　Children usually cooperate with their friends, classmates and family. 孩子们通常与他们的朋友、同学和家人合作。

　　When do children usually cooperate with their friends and family? 孩子们通常什么时候会与朋友和家人合作呢？

　　Friends cooperate to solve difficult problems. 朋友合作是为了解决难题。

　　Children help their mom clean the house and set the table for dinner. 孩子们帮妈妈清扫房间，摆好桌子吃饭。

　　People must learn to cooperate with others. 人们必须学会与他人合作。