在量子材料的领域中,拓扑的概念提供了一个强大的透镜,通过它我们可以理解和预测新的物质相。
Everyone is in favor of free speech. Hardly a day passes without its being extolled, but some people's idea of it is that they are free to say what they like, but if anyone else says anything back, that is an outrage.