互动封闭仿真课堂1、智能交互 2、电子板书式视频教学 3、5分钟一次互动问答 4、封闭课堂
The first secret of happiness is to enjoy the simple things in life. Too often，we spend so much time thinking about the future，for example，getting into college or getting a good job，that we don't enjoy the present. You should enjoy life's simple pleasures，such as reading a good book，listening to your favorite music，or spending time with close friends. People who have close friends usually enjoy happier and healthier lives.
The second secret of happiness is to be active. Many people go dancing or play sports. People can forget about their problems and only think about the activities.