These Raptors could pick up low frequency sound.

这些迅猛龙可以听到音。

Low-frequency noise, in particular, just goes through the trees as though they aren't there.

特别是噪音无视树木存在，直接穿过他们释放出来。

Noise-canceling headphones are best, removing persistent low-frequency hums.

降噪耳机最擅长去除持续嗡嗡。

We do retain most of all low frequency sounds.

我们确实能听到大部分音。

Although we can't hear these low sounds, we can feel them.

虽然我们听不见这些音，但我们能感觉到。

And we see this lower frequency formant here.

我们可以看到这个共振峰。

Over a combined total of 26 hours, 32 calls were captured—including some low-pitched pulses.

总计超过26小时记录时间内，一共收到32个音文件—包括了一些波脉冲信号。

Even more effective, low-frequency sounds, with their long wavelengths, travel much further than high frequencies.

更有效是，音波长较长，比高音传播得更远。

So they broke out a set of very very low frequency speakers.

他们搞出了一套非常非常扬器。

And the areas with the longer fibers resonate with lower-frequency waves.

纤维较长区域与波共振。

This could be triggered by low or high-frequency vibrations, a stretch, or simply light, static pressure.

这可能会由或高感受、拉伸，或仅仅由轻微静态压所引发。

These sizable sound-collectors help the jerboas sense low frequency noises, and keep cool by radiating heat.

这些体型巨大音收集器帮助长耳跳鼠感知噪音，并通过散热保持凉爽。

At the other end, in the deep infrasound, elephants and whales, tigers and some birds make sound.

另一端次，大象、鲸鱼、老虎和一些鸟类会制造这样音。

Here we are referring to high and low frequency words - so it means how often they occur.

这里我们指是高词和词——所以它指是它们多久出现一次。

So the way we're going to do this is we're going to listen to the low end first.

我们做法是先来听一下。

Developed by professor David Premack, the Premack principle states, " More probable behaviors will reinforce less probable behaviors."

由大卫·普雷马克教授提出普雷马克原理指出：“高行为会强化行为。”

We register short waves at high frequencies as bluish colors, while long, low frequencies look reddish to us.

我们将高短波记录为蓝色，而长在我们看来是红色。

Now they knew lower frequency words but they hadn't mastered those most important words.

他们知道词，但是他们还没有掌握那些最重要单词。

For Parasaurolophus, genetic modifications over time give them the tools both to pick up and emit these low-frequency sounds.

对副栉龙来说，长期基因变化使它们拥有了学习和模仿这些音工具。

Growling is quite a distinct sound, and other animals that are much larger use low-pitched sounds, when they're being threatening.

嚎叫是非常特殊音，其他大型动物在感受到威胁时，会使用音。