acoustical

The ancient Greeks were aware of other acoustical principles, at least empirically.

至少在实践上，古希腊人也知道其他的声学原理。

And, of course, there's this-- another acoustical phenomenon here we've talked about before, what's the relationship within an octave?

当然,就是这个,我们以前谈论过的,另一种声学现象,八度的内部联系是什么呢