A low pitched bark indicates aggression and is possibly a threat.

低声调的吠叫意味着狗狗挑衅，可能也是一种威胁。

youdao

These sounds may be loud or quiet, clear or muffled, high or low pitched, pleasant or unpleasant in tonality.

这些声音可能大声可能小声、可能清脆可能较闷、可能高亢可能低沉、可能悦耳可能难听。

youdao

No one knows how the brain tells the distinction among high pitched and low pitched sounds or among noisy and supple sounds.

没人知道大脑如何分辨高音低音还有喧闹和轻柔之音。

youdao

The species had its best breeding season for 130 years last year, measured by the number of "booming" males, whose distinctive mating call is a low-pitched, far-carrying "boom".

BBC: Rescued rare bird to be released

These are now being pitched to relatively low-brow customers.

ECONOMIST: Hedge funds

Those elements are traditionally performed by three instruments: a triangle, an accordion, and a zabumba, a drum pitched somewhere between a low snare and a small bass.

NPR: Northern Brazilian Tradition, New York Style