复式投注怎么计算器 www.xsqkah.com.cn 作者:admin


2015-2-3 15:27










As we grow older, we often lose the extrements of our hearing spectrum. So how many of the following sounds can you hear?
隨著年齡的增長,我們會失去聽力系統中的極端部分。下面這幾段聲音 你能聽到多少種?

How old are your ears? OK, if you can hear 8000Hz, you are both alive and not hearing impaired. But let's keep raising the frequency. How high could you hear? If you could hear all of those frequencies, you are probably under 20 years old. But that won't last forever. Unlike other organs such as the liver or skin, the inner ear does not have the capacity to regenerate.

In your ear, there are thousands of tiny nerve cells celled "Hair Cells". These are responsible for picking up different frequencies, and sending the signal to the brain where it's processed. But as you age, the continue exposure to noise and loud sounds can break, bend and destroy these cells.
在你的耳內分布著數千微小的神經細胞“聽毛細胞“。它們各自負責捕捉不同的頻率并把信號送到大腦內做進一步處理。但在你年齡增長時, 持續暴露在噪音和高響度聲音將會破壞、彎曲并毀滅這些細胞。

So, why do the high frequencies go first? It turns out that the hair cells tune to high pitches are the first to encounter sound waves. As a result, they experience more stress and tend to degenerate earlier. Which is why the older you are, the harder you hear high pitches. Got a burning question you want an answer?