And we placed infrasonic microphones around the elephants as we did these experiments.

进行这些实验时，我们把次器放置大象周围。

But it travels even further through the earth as infrasonic rumbles.

但随着次波的隆隆，播得更远。

The system, the firm claims, produces frequencies from infrasonic to ultrasonic that are " essentially capable of effectively simulating any ship" .

该公司称，该系统产生从次波到超波的频率，“基本能够有效模拟任何船只”。

And it turns out they're communicating to each other in infrasonic rumbles to warn each other of the threat of bees and to stay away from the area.

后来发现们次波段隆隆低语交流来警告彼此蜜蜂的威胁并且远离蜜蜂所区域。