I used to think the world was broken down by tribes. Then I thought it was broken down by rich and poor. Then I thought it was broken down by stupid and smart. But I know now that it is broken down by people who are alive and people who are dead.
短期利益永远不应以牺牲长期可持续性为代价。
Gravitational waves are a new way of observing the universe, allowing us to hear the cosmos.