The walls of a garden should be high enough to keep the world out, but low enough to let the sky in.
花园的墙应该足够高以将世界挡在外面，但又足够低以让天空进来。
在物理学的领域里，我们不仅是观察者，也是我们试图理解的现实的创造者。
The decay of political institutions is often a result of the inability to adapt to changing circumstances, leading to rigidity and eventual decline.
The writer's only responsibility is to his art.
对黑洞的研究将我们带到了理解的边缘，在那里已知的物理定律失效，新的理论必须出现。