【北京】少儿英语配音《声音的传播》中英文课件配音文案—解说词

少儿英语配音《声音的传播》中英文课件配音文案

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5000205 Transmission of Sound
5000205声音的传播
Every sound is produced by a vibration. Vibration is the back and forth movement of an object. As you speak, vibrations are produced by the vocal cords in the throat. You can hear only when the sound energy reaches your ears. But how does sound energy travel? Wonder how that works? Come let’s go across to Dr Zook.
每一种声音都是由振动产生的。振动是指物体所做的往返运动。当你说话的时候，振动是由你喉咙里的声带产生的。只有当声能到达你的耳朵时你才能听见。但是声能是如何传播的呢？想知道这过程是怎么样的吗？来吧，让我们走向祖克博士吧。
Objective:
课程目标：
To learn how sound energy travels.
学习声能是如何传播的。
Sound energy travels in the form of sound waves. There are mainly two types of waves: transverse wave and longitudinal wave. Let us see how waves travel. We can use a slinky spring to observe both types of waves. Emily is holding one side of the slinky while Dr Zook is holding the other end. With a quick upward flick of the wrist Dr Zook has sent energy travelling through the slinky. Notice how the slinky moves. This is a transverse wave. In a transverse wave, the particles vibrate at a right angle to the direction of the wave. The wave travelled from Dr Zook to Emily and back. Now let’s see what a longitudinal wave looks like. Emily is holding one end of the slinky while Dr Zook is pulling its other end towards himself and then pushing it towards Emily. Watch closely and you will notice that some of the coils crowd close together and then slowly move farther apart. This is because the vibrations are parallel to the direction of the wave. If the wave moves from right to left, then the particles also vibrate from right to left. This is a longitudinal wave. Sound waves are longitudinal waves. These waves travel at different speeds in different mediums. The medium could be a solid, liquid or gas. Now let’s see how this works. In a solid, the particles are very close together. Sound energy moves as one particle hits the other particle. With the particles being so close together, sound travels quickest through a solid. If we look at the particles in a liquid, they appear to be slightly further apart when compared to solid, thus, sound energy takes a little longer to travel through a liquid. Look at the particles of gas. They are spread out and hence sound waves travel most slowly through them. Now we know how sound travels in different media. The vibration of particles produces waves. Wavelength is the distance between two consecutive compressions or rarefactions. The number of waves passing through a point in a second is called frequency and it is measured in hertz. Sound waves travel in all directions. Sound gets reflected, that is, it bounces back on hitting a solid surface. Bouncing back of sound is called echo. Bouncing back of sound is purposefully used in detecting the depth of sea beds. That’s amazing, isn’t it?
声能是以声波的形式传播的。声波主要有两种类型：横波和纵波。让我们看看声波是如何传播的。我们可以使用一个软弹簧来观察这两种类型的声波。艾米莉正握着软弹簧的一端，而祖克博士正握着另一端。祖克博士的手腕快速向上摇动促使能量沿着软弹簧传播。注意软弹簧是如何运动的。这是一种横波。在横波中，质点振动的方向与波的传播方向是垂直的。波从祖克博士传到艾米莉，再从艾米莉传到祖克博士。现在，让我们来看看纵波是什么样的。艾米莉正握着软弹簧的一端，而祖克博士正把软弹簧的另一端拉向自己，然后把它推向艾米莉。仔细地观察，你将会注意到一些线圈紧密地聚在一起，然后缓慢地向远处运动分开。这是因为振动的方向与波传播的方向平行。如果波是从右到左运动，那么质点也是从右到左振动。这是一种纵波。声波就是纵波。这些波在不同的介质中以不同的速度传播。介质可以是固体、液体或气体。现在，让我们看看这过程是怎么样的。在固体中，质点彼此靠得非常近。当一个质点撞击另外一个质点时，声能运动。因为质点彼此靠得是如此的近，所以声音在固体中传播的*快。如果我们看液体中的质点，与固体比较，它们似乎离得稍微有些远，因此，声能在液体中传播所需要的时间更长一些。
看看气体的质点。它们是分散的，因此声波在它们中的传播是*慢的。现在，我们知道声音是如何在不同的介质中传播的。质点的振动产生波。波长是指相邻两个密部或疏部之间的距离。在一秒内通过一点的波的数量称为频率，它的计量单位是赫兹。声波向各个方向传播。声音被反射，也就是，声音在碰到固体表面时被反射回来。反射回来的声音称为回声。反射回来的声音被有目的地用于探测海底的深度。这很神奇，对不对？
Summary:
总结：
Every sound is produced by a vibration.
每一种声音都是由振动产生的。
Vibrations are produced by our vocal cords when we speak.
当我们说话时，振动是由我们的声带产生的。
There are two types of waves: transverse wave and longitudinal wave.
有两种类型的波：横波和纵波。
In a transverse wave, the particles vibrate at a right angle to the direction of the wave.
在横波中，质点振动的方向与波的传播方向是垂直的。
In a longitudinal wave, vibrations are parallel to the direction of the wave.
在纵波中，振动的方向与波的传播方向是平行的。
Sound waves are longitudinal waves.
声波是纵波。
Sound travels quickest through a solid.
声音在固体中传播得*快。
Wavelength is the distance between two consecutive compressions or rarefactions.
波长是指相邻两个密部或疏部之间的距离。
The number of waves passing through a point in a second is called frequency and it is measured in hertz.
在一秒内通过一点的波的数量称为频率，它的计量单位是赫兹。
Bouncing back of sound is called echo.
反射回来的声音称为回声。

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