Sound is created by vibrations.
声音是由振动产生的。
When something vibrates, it moves back and forth very quickly.
当物体振动时，它会快速地来回移动。
This movement makes the air around it vibrate too.
这种运动会让周围的空气也跟着振动。
The vibrating air creates sound waves.
振动的空气会产生声波。
These sound waves travel through the air to reach our ears.
这些声波通过空气传播到我们的耳朵。
Our ears pick up the sound waves, and our brain understands them as sounds.
我们的耳朵接收声波，然后大脑把它们理解成声音。
Sound can travel through air, water, and solid objects.
声音可以通过空气、水和固体传播。
That’s why we can hear people talking, birds singing, and music playing.
这就是为什么我们能听到人们说话、鸟儿歌唱和音乐播放的原因。
Underwater, sound can travel even faster than in air.
在水下，声音传播得比空气中还快。
That’s why whales and dolphins can communicate over long distances in the ocean.
这就是为什么鲸鱼和海豚能在海洋中远距离交流。
Sound can also move through solid materials.
声音也可以通过固体传播。
If you put your ear on a table and tap it, you can hear the sound through the table.
如果你把耳朵贴在桌子上敲一下，你能听到声音通过桌子传播。
But in space, there is no air.
但是在太空中，没有空气。
Without air, sound waves have nothing to travel through.
没有空气，声波就无法传播。
That’s why astronauts cannot hear sounds in space.
这就是为什么宇航员在太空中听不到声音的原因。
If you shout in space without a space suit, no one will hear you!
如果你在太空中不戴宇航服大喊，没人能听到你！
This shows that air is very important for us to hear sounds.
这说明空气对我们听到声音非常重要。
Now you know that sound travels through air, water, and solids, but not in space!
现在你知道声音可以通过空气、水和固体传播，但不能在太空中传播了！
