Indeed, some toothed whales and bats emit sound pulses around 200,000 hertz and listen for the reflections.

事实上，一些齿鲸和蝙蝠会发出 20 万赫兹左右的声脉冲收听反射声。

Anything in the 1000 hertz range or below.

任何在 1000 赫兹范围内或以下的声音。

Researchers observed lip smacking at an average of 4.15 hertz.

研究人员观察到咂嘴的平均频率为4.15赫兹。

What does the nano hertz in NANOGrav refer to explicitly?

NANOGrav 中的“纳赫兹”具体指的是什么？

A biological neuron fires, maybe, at 200 hertz, 200 times a second.

一个生物神经元所发出的脉冲频率 大约位于 200 赫兹，每秒 200 次。

So nano hertz is the gravitational waves frequency that we're looking at.

“纳赫兹”就是我们正在寻找的引力波频率。

Well, baleen whales emit sounds around 14 hertz, the deepest among mammals.

须鲸能发出 14 赫兹左右的声音，是哺乳动物中最低沉的。

Parasaurolophus' general resonant frequency as low as 40 hertz, a sound almost as deep as a foghorn.

副栉龙的共振频率一般低达40赫兹，这种声音几乎和雾角一样低了。

The females are at a much lower pitch. They were around 400 hertz.

HS：女性的音高要低得多。 它们的频率约为 400 赫兹。

[Melany] It's this frequency from about 75 hertz up to about 100 hertz.

- [Melany] 这是从大约 75 赫兹到大约 100 赫兹的频率。