| 1. | These ultrasonic oscillations may be continuous , but in most cases they are short bursts of ultrasonic energy , stimulated by various amplitude peaks of the audible signal , and dying out quickly , but recurring frequently
这些超声波震荡可能是连续的，但大多数情况下，它是由可听范围信号电平的不同峰值激励产生的一些超声能量的短脉冲，很快消退但频繁的出现。 |
