This phenomenon, known as hysteresis, means that for a given voltage there are two corresponding vibrational frequencies for the bar.

这种现象被称作迟滞，这意味着对于某个给定的电压，有两个对应的震动频率。

youdao

So it's centered at this frequency that was expected, but it's actually split into two different frequencies.

它的中心在预计频率处，但劈裂成两个不同频率。

youdao

Warning: Do not run more than one of the above programs at the same time. It may cause confusion like switching between two frequencies all the time.

警告：不要同时运行多个变频程序。这会引起混乱，例如在两个频率之间来回切换。

youdao

Two Arab satellite broadcasting corporations, Nilesat and Arabsat, recently refused to allow al-Alam to continue broadcasting on their frequencies, provoking protestations from Tehran.

VOA: standard.2009.11.16

Now, Dr Cummer and his colleagues have shown off an acoustic cloaking technique that works in air, for audible frequencies between one and four kilohertz - corresponding to two octaves on the higher half of a piano.

BBC: Acoustic 'cloaking device' shields objects from sound