Nowadays,our lives are changed because of the development of science and technology .My grangparents live in the countryside, we were always too busy to visit them in the pass.However,my uncle taught them to use WeChat last month. After then,they often talk with us on it.We are so happy about that.Science and technology will provide more than 3 trillion to world's economic growth.What's more?They are promoting the development of education、medical treatment abd so on ,creating more values.

In a word,everyone should take an active part in creating something new and useful.