他离开了去换一根吉他弦。
另外，拉开弦也不需要太多力气。
In addition, it requires little strength to draw the string.
突然，他的手指弹错了弦。
这是西班牙吉他，弦是用动物制品做的。
This is the Spanish guitar and the strings were made from animal products.
吧的一声，弦断了。
噢，它现在已经干了，没有损坏；弦还很紧。
Oh, it is dry again, and is not hurt at all; the string is quite tight.
小提琴有四根弦。
吉他有六根弦。
这弦怎么了？
让我们设想这样一个情景，我们拿着小提琴的弦弹拨它。
Let's take the situation where we take a violin string and we pluck it.
我拿我的事业来打赌就是弦理论。
在它的众多先驱里，最著名的当属弦论。
Of its many predecessors, the most popular is string theory.
好，第一个问题是，这里运用了什么弦技巧？
Okay. First question: What string technique is being used here?
那就是小提琴的弦。
声可托于弦管，名可留于竹帛。
请快速演奏一次拨弦行吗。
相信你自己：每颗心都随那根弦震颤。
缺乏实验证明也许是弦理论最致命之处。
However, it is that absence of proof that is perhaps most damning.
我喜欢中国传统的弦索乐。
它甚至有助于对超弦理论的某些方面进行间接的检测。
It may even help to indirectly test some components of superstring theory.
如果宇宙弦存在，每根弦都像质子一样小，密度却极大。
If they exist, each string would be as thin as a proton, but incredibly dense.
超弦理论以这个观点为基础，并从下向上构筑了整个宇宙。
Superstring theories take this idea and build the entire universe from the bottom up.
超弦理论以这个观点为基础，并从下向上构筑了整个宇宙。
Superstring theories take this idea and build the entire universe from the bottom up.
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