"书籍是人类灵魂的镜子,它们反映出我们最深层的恐惧和希望。"
书籍是人类灵魂的镜子,它们反映出我们最深层的恐惧和希望。
States are rational actors that seek to maximize their relative power in order to ensure their survival in a competitive international system.
Science is the most powerful tool for human beings to understand and transform the world.