如何发出声音

Sound can make matter vibrate, and vibrating matter can make sound.

::声音可以使物质振动，而振动的物质可以发出声音。

What sounds can I hear?

Listen and you can hear many different sounds.

What sounds can you hear?

::我能听到什么声音？听，你能听到许多不同的声音。你能听到什么声音？

You can hear the wind blow.

Whoosh goes the wind.

You can hear a car.

Zoom goes the car.

You can hear the slamming of a door.

Whack goes the door.

The world is full of sounds to hear.

::你可以听到风在吹。风呼啸而过。你可以听到汽车的声音。祖姆开走了汽车。你可以听到关门的声音。门砰的一声关上了。这个世界充满了可听的声音。

Animals make sounds too!

Meow goes the cat.

Ruff goes the dog.

Roar goes the lion.

What are some other sounds that animals make?

::动物也会发出声音！猫喵喵叫着。狗叫起来了。狮子吼叫。动物发出的其他声音是什么？

What causes sounds?

::什么引起声音？

Sounds are caused when something vibrates.

All things are made of matter.

When matter vibrates, it makes sound.

::声音是由物体振动引起的。万物都是由物质构成的。当物质振动时，就会发出声音。

Tapping on a metal bucket makes a sound.

It is a different sound than kicking a tire.

The type of matter determines the sound an object makes.

::敲击一个金属桶会发出声音。这和踢轮胎的声音不一样。物质的种类决定了物体发出的声音。

What are the characteristics of sound?

Some sounds are loud like a marching band.

Some sounds are soft like the purr of a kitten.

::声音的特点是什么？有些声音像军乐队一样响亮。有些声音像小猫的呼噜声一样轻柔。

Some sounds have a high pitch.

Some sounds have a low pitch.

Flutes have a high pitch sound.

Tubas have a low pitch sound.

::有些声音有高音。有些声音有低音。笛子有高音。大号有低音。

You can hear all kinds of sounds.

Some sounds are very loud.

Some sounds are very soft.

Whispers are very soft.

To hear a whisper you need to be close up.   

::你可以听到各种各样的声音。有些声音很大。有些声音很小。耳语很轻。要听到耳语，你需要靠近一点。

Some animals can hear sounds that we can’t.

Dogs can hear very high pitched sounds we can’t hear.

Other animals can hear very soft sounds.

Some other animals have ears that are good for hearing

underwater.

::有些动物能听到我们听不到的声音。狗能听到我们听不到的非常高的声音。其他动物可以听到非常轻柔的声音。其他一些动物的耳朵在水下听力很好。

How can sound make matter vibrate?

::声音是怎样使物质振动的？

I can see the drummer hitting the drum.

The drum is made of matter.

When it is struck, it vibrates.

When matter vibrates, it makes a sound.

I can feel the beat of the big bass drum.

The sound makes me vibrate.

::我能看见鼓手在敲鼓。鼓是由物质制成的。当它被击打时，它会振动。当物质振动时，就会发出声音。我能感觉到大低音鼓的节拍。这声音使我颤抖。

Sounds are everywhere for our ears to hear.

::声音无处不在，我们的耳朵可以听到。