It's constantly chopping and changing

那些咕噜声的长度

the length of those purr bouts.

在不断变化

And the purr is much faster in certain parts, isn't it?

这些叫声在某部分特别快 是吗

Back at the lab,

在实验室

Sarah's colleague examines the frequencies of the purrs.

莎拉的同事在测试呜呜声的频率

At the top, we've got the solicitation purr

在顶端的是乞求式咕噜

and down below, we've got the non-solicitation purr.

在底部的是非乞求式咕噜

Both of these are low-frequency purrs,

他们都是低频咕噜声

but what particularly stands out quite clearly

但让人非常注意的

is that complete stand-out peak

是乞求式咕噜

you can see with a solicitation purr.

一个完整的峰值

It's very isolated from the other frequencies around it,

与它附近的其他频率完全独立开来

which suggests it would really stand out quite clearly.

这说明它非常能吸引注意力

You don't see that at all in the non-solicitation purr.

这在非乞求式咕噜声中没有出现过

And there's a surprising reason why we react so strongly

我们对这种频率的反应很大

to this frequency in the purrs.

其原因十分令人惊

Because embedded within it is the same frequency

因为它与婴儿啼哭的频率

as a baby's cry.

完全相同

重点解释：

1.at the top 在顶部

例句：She sang at the top of her throat.

她放开嗓门大声歌唱。

2.stand out 突出；脱颖而出

例句：His height makes him stand out in the crowd.

他身材高大，因此在人群中很突出。

3.isolate ... from 使脱离

例句:We should never isolate ourselves from the masses.

我们永远不能脱离群众。