Mathematics is the most beautiful and most powerful creation of the human spirit.
今天我们必须负责任地开采煤炭,这样我们的孩子才能继承能源安全和健康的环境。
It's easier to ask forgiveness than it is to get permission.
唯一真正的信仰是对爱的信仰。
The bike is my instrument of change. It's my tool to make a difference.