The galactic center is a unique natural experiment in strong gravity.
学习不是强制性的...生存也不是。
The development of modern culture is characterized by the predominance of what one might call the objective spirit over the subjective spirit.
计算机科学中最强大的工具不是计算机本身,而是人类的思维。
The beauty of computational complexity lies in its ability to classify problems based on their inherent difficulty.