Socrates never says Simmias, here's what your objection goes wrong: harmony is not really invisible or can't be destroyed, whatever it is, so we don't have a counterexample.

苏格拉底从没说过，西米亚斯,你的观点在这里有错,和声并非无形或者不可毁灭，所以我们没有了反例。

耶鲁公开课 - 死亡课程节选

So we'll focus on the bass and we'll try to sing the bass, and if we find that in singing the bass our voice is not changing, probably the harmony hasn't changed.

现在把我们的注意力放到低声部上，尽量唱出低声部，如果在唱的过程中我们觉得自己的声音没有变化，那和声就很有可能没有改变。

耶鲁公开课 - 聆听音乐课程节选

If he could show us, he could convince us that harmony is not really invisible, then we would no longer have a counterexample to the claim that the invisible can't be destroyed.

如果他可以说服我们,和声并非无形，那我们就没有了,灵魂不可毁灭,这一论断的反例。

耶鲁公开课 - 死亡课程节选

They just elongated each measure by its same amount so we had harmony changing on each measure, and then in that middle section each chord was changing at the rate of two measures.

但它的基本形式没有改变，而在每个小节中和声都发生了改变，接着在中间的乐节，每个和弦每两小节改变一次。

耶鲁公开课 - 聆听音乐课程节选

No. So that one didn't change either.

没有，所以这一段音乐中的和声也没有改变。

耶鲁公开课 - 聆听音乐课程节选