Sound
声音
Sound is a kind of energy that you can hear.
声音是一种你能听到的能量。
Sound is made when something vibrates.
声音是在某物振动时发出的。
Vibrate means to move back and forth quickly.
振动意味着快速来回移动。
When you talk or sing, place your hand on the side of your neck.
当你说话或唱歌时，把手放在脖子的一侧。
Then you will feel your neck vibrating.
然后你会感觉到脖子在震动。
When you hit a drum, it vibrates.
当你敲鼓时，它会振动。
Air around the drum vibrates too.
鼓周围的空气也会振动。
When the air reaches your ears, you hear the sound.
当空气到达你的耳朵时，你会听到声音。
There are loud sounds and soft sounds.
有响亮的声音和柔和的声音。
The volume of a sound is how loud or soft a sound is.
声音的音量是声音的响度或柔和程度。
When you yell, you make a loud sound.
当你大喊大叫时，你会发出很大的声音。
When you whisper, you make a soft sound.
当你耳语时，你会发出柔和的声音。
All sound has pitch.
所有的声音都有音高。
Pitch is how high or low a sound is.
音高是声音的高低。
A drum is an instrument with a low pitch.
鼓是一种低音的乐器。
A bell is an instrument with a high pitch.
钟是一种音调很高的乐器。