发现恒星围绕银河系中心的超大质量黑洞运行是天体物理学的一个转折点。
The study of automorphic representations reveals the hidden symmetries of number fields.
"She was free in her wildness, she was a wanderess, a drop of free water. She belonged to no man and to no city."
为了将关心转变为行动,我们需要发现问题,找到解决方案以及评估后果。但是世界的复杂性使得这三步都难于做到。