translation.en: One of the most promising candidates for a unified theory is string theory, and the essential idea is, if you could zoom in on the fundamental particles that make up our world, you'd see actually that they're not particles at all, but tiny vibrating strings of energy, with each frequency of vibration corresponding to a different particle, a bit like musical notes on a guitar string.
translation.zh: 最有希望的候选者之一就是弦理论了， 它的核心思想就是， 如果你能够放大组成我们的世界的粒子， 你会发现它们事实上根本就不是粒子， 而是微小的正在震动的能量弦， 每个不同频率的震动 代表着不同的粒子， 有点类似于吉他弦上的音符。