广义相对论在某种意义上就是引力场的理论。
The past is not dead. It is not even past.
释义:即使你的官位清廉如水,也难免碰到那些滑头狡猾的下属。
科学是人类理解和改造世界的最有力工具。
When you're depressed, It always helps to lean your head on your arm. Arms like to feel useful.