Every organism is in a struggle for existence.
The international system is inherently competitive, and states are constantly trying to outmaneuver each other.
I don't need validation from anyone else. I know my worth.
Leadership means making tough decisions today that will benefit future generations.
每个科学家都梦想着做一些能够帮助世界的事情。
过去通过传记的书页向我们低语。
The arithmetic of algebraic groups is a central theme in the Langlands program.