少兒英語配音《聲音的傳播》中英文課件配音文案

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5000205 Transmission of Sound
5000205聲音的傳播
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.
每一種聲音都是由振動(dòng)產(chǎn)生的。振動(dòng)是指物體所做的往返運(yùn)動(dòng)。當(dāng)你說話的時(shí)候，振動(dòng)是由你喉嚨里的聲帶產(chǎn)生的。只有當(dāng)聲能到達(dá)你的耳朵時(shí)你才能聽見。但是聲能是如何傳播的呢？想知道這過程是怎么樣的嗎？來吧，讓我們走向祖克博士吧。
Objective:
課程目標(biāo)：
?To learn how sound energy travels.
?學(xué)習(xí)聲能是如何傳播的。
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?
?聲能是以聲波的形式傳播的。聲波主要有兩種類型：橫波和縱波。讓我們看看聲波是如何傳播的。我們可以使用一個(gè)軟彈簧來觀察這兩種類型的聲波。艾米莉正握著軟彈簧的一端，而祖克博士正握著另一端。祖克博士的手腕快速向上搖動(dòng)促使能量沿著軟彈簧傳播。注意軟彈簧是如何運(yùn)動(dòng)的。這是一種橫波。在橫波中，質(zhì)點(diǎn)振動(dòng)的方向與波的傳播方向是垂直的。波從祖克博士傳到艾米莉，再?gòu)陌桌騻鞯阶婵瞬┦俊，F(xiàn)在，讓我們來看看縱波是什么樣的。艾米莉正握著軟彈簧的一端，而祖克博士正把軟彈簧的另一端拉向自己，然后把它推向艾米莉。仔細(xì)地觀察，你將會(huì)注意到一些線圈緊密地聚在一起，然后緩慢地向遠(yuǎn)處運(yùn)動(dòng)分開。這是因?yàn)檎駝?dòng)的方向與波傳播的方向平行。如果波是從右到左運(yùn)動(dòng)，那么質(zhì)點(diǎn)也是從右到左振動(dòng)。這是一種縱波。聲波就是縱波。這些波在不同的介質(zhì)中以不同的速度傳播。介質(zhì)可以是固體、液體或氣體?，F(xiàn)在，讓我們看看這過程是怎么樣的。在固體中，質(zhì)點(diǎn)彼此靠得非常近。當(dāng)一個(gè)質(zhì)點(diǎn)撞擊另外一個(gè)質(zhì)點(diǎn)時(shí)，聲能運(yùn)動(dòng)。因?yàn)橘|(zhì)點(diǎn)彼此靠得是如此的近，所以聲音在固體中傳播的最快。如果我們看液體中的質(zhì)點(diǎn)，與固體比較，它們似乎離得稍微有些遠(yuǎn)，因此，聲能在液體中傳播所需要的時(shí)間更長(zhǎng)一些。
看看氣體的質(zhì)點(diǎn)。它們是分散的，因此聲波在它們中的傳播是最慢的?，F(xiàn)在，我們知道聲音是如何在不同的介質(zhì)中傳播的。質(zhì)點(diǎn)的振動(dòng)產(chǎn)生波。波長(zhǎng)是指相鄰兩個(gè)密部或疏部之間的距離。在一秒內(nèi)通過一點(diǎn)的波的數(shù)量稱為頻率，它的計(jì)量單位是赫茲。聲波向各個(gè)方向傳播。聲音被反射，也就是，聲音在碰到固體表面時(shí)被反射回來。反射回來的聲音稱為回聲。反射回來的聲音被有目的地用于探測(cè)海底的深度。這很神奇，對(duì)不對(duì)？
Summary:
總結(jié)：
?Every sound is produced by a vibration.
?每一種聲音都是由振動(dòng)產(chǎn)生的。
?Vibrations are produced by our vocal cords when we speak.
?當(dāng)我們說話時(shí)，振動(dòng)是由我們的聲帶產(chǎn)生的。
?There are two types of waves: transverse wave and longitudinal wave.
?有兩種類型的波：橫波和縱波。
?In a transverse wave, the particles vibrate at a right angle to the direction of the wave.
?在橫波中，質(zhì)點(diǎn)振動(dòng)的方向與波的傳播方向是垂直的。
?In a longitudinal wave, vibrations are parallel to the direction of the wave.
?在縱波中，振動(dòng)的方向與波的傳播方向是平行的。
?Sound waves are longitudinal waves.
?聲波是縱波。
?Sound travels quickest through a solid.
?聲音在固體中傳播得最快。
?Wavelength is the distance between two consecutive compressions or rarefactions.
?波長(zhǎng)是指相鄰兩個(gè)密部或疏部之間的距離。
?The number of waves passing through a point in a second is called frequency and it is measured in hertz.
?在一秒內(nèi)通過一點(diǎn)的波的數(shù)量稱為頻率，它的計(jì)量單位是赫茲。
?Bouncing back of sound is called echo.
?反射回來的聲音稱為回聲。

配音 ? ?

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