数学是一门活生生的学科，随着新的思想和发现不断演变。
Mathematics is a living subject, constantly evolving with new ideas and discoveries.
"The most difficult thing is to make something simple."
天然气是通往更清洁能源未来的桥梁，但我们必须负责任地跨越这座桥梁。
If you borrow something， try to return it in better shape than you received it. Clean it， sharpen it， fill it up.
There are tracts in my life that are bare and silent. They are the open spaces where my busy days had their light and air.
Leadership is about making tough decisions today that will benefit future generations.