Fish Movement托福聽(tīng)力原文翻譯及問(wèn)題答案

Fish Movement托福聽(tīng)力原文翻譯及問(wèn)題答案，今天中國(guó)教育在線就來(lái)為大家分析這個(gè)問(wèn)題。

一、Fish Movement托福聽(tīng)力原文：

So we’ll continue today with the topic of fish movement and we'll focus on the role of fins.You can think of things pretty much like the arms and legs of humans.It‘s what allows movement basically.But as we will see they also do a lot more.Before we go on with the function of specific fins,I just say a few general remarks.So you get an overall picture.Fins are mainly used for moving the fish forward for propulsion as it's called,but they’re also needed for stability,steering and braking.That's right.Fish have to have a way to put on the brakes too.

Now,some fish are so fast,they‘re not good at stopping even with their fins.Requiem sharks,for example.You know,how sharks are built for speed.But these requiem sharks have difficulty stopping.They're unable to brake themselves efficiently,so they must take sharp turns in order to slow down or stop.Because of this,hmm,this brake problem.Requiem sharks avoid swimming into coral reefs.Coral reefs are usually crowded,don't allow a lot of space for large fish to take sharp turns.So these sharks roam around the outside of the coral reefs.

Um,a fish lives in a 3 dimensional world,you know,with forces pushing and pulling it in all directions.The forces in referring to are gravity,which pulls the fish downward.Buoyancy,which holds it up in the water,and something called drag.

Now,drag means to slow down,to impede movement.It's a term that applies to the effect of the force acting on any object moving through a fluid or through air.So for instance,the force of air on an airplane,drag acts to pull the airplane in the opposite direction to the direction of motion.

Well,all of these forces,gravity,buoyancy,and drag could be potentially dangerous for fish if they weren't for the fact that they have.Yep,you guessed it,fins.So,fins allow fish to keep from rolling or flipping over.They stabilize the fish's head.

Fins are crucial for determining the speed at which fish travel,to change direction.In a word,fins allow the fish to maneuver efficiently through the water.Okay.Remember,most fish have two general types of fins.

The first type is median fins.Median fins are located along the midline of the fish such as the dorsals on the back.And the caudal fins,the tail fin.The other type of fin is the paired fins at each side of the fish.

For today,the caudal fin is the one will focus on.The caudal fin,that is the tail fin.Is the main propulsive agent for most fish,it keeps them moving forward.Some fish have a broad tail that gives the fish a quick burst of speed from a standing position.And this is useful for going after a meal or swimming away from a predator.

You'll find that fast,long distance swimmers have a very long and narrow caudal fin,which is very efficient.Now,do all fish have caudal fins?No,not at all.Some sea horses and eels get along without them just fine.Well,a seahorse swims in an upright vertical position.It looks like its standing up,right.So it uses a fin on its back,the dorsal fin,as if it were a caudal fin.

And eels,well,don't really need to swim very rapidly.And like l said,most are missing the caudal fin,but most fish do have caudal fins.I give you two examples of caudal fins,and well see how they work.Okay?Let's see.I focus on the tuna and the black fish.The tuna's body is built for speed,but the caudal in,the caudal fin is key here because its moon-shaped tail creates hardly any drag in the water.And it can reach really high speeds of even 60 to 80 kilometers per hour and that's pretty amazing.

Then there's the really interesting case of the blackfish,which has a rounded caudal fin.As you can see.And in sudden bursts,it almost acts like a propeller on a plane that can even produce the sound that as an explosion.I bet you never thought of fish fin could do that.And you can see how this is useful to a fish when it goes to catch something or tries to avoid a predator.It needs to accelerate in an instant.

二、Fish Movement托福聽(tīng)力中文翻譯：

所以今天我們將繼續(xù)討論魚的運(yùn)動(dòng)，我們將重點(diǎn)討論鰭的作用。你能想到的東西很像人類的胳膊和腿。它基本上允許移動(dòng)。但正如我們將看到的，他們也做了很多。在我們繼續(xù)討論特定鰭的功能之前，我只說(shuō)幾句一般性的話。所以你得到了一個(gè)整體的畫面。鰭主要用于推動(dòng)魚前進(jìn)，但也用于穩(wěn)定、轉(zhuǎn)向和制動(dòng)。這是正確的。魚也必須有辦法剎車。

有些魚跑得很快，即使用鰭也不擅長(zhǎng)停下來(lái)。例如，安魂曲鯊魚。你知道，鯊魚是如何為速度而生的。但這些安魂鯊很難阻止。他們無(wú)法有效地剎車，因此必須急轉(zhuǎn)彎才能減速或停車。因?yàn)檫@個(gè)，嗯，剎車問(wèn)題。安魂曲鯊魚避免游進(jìn)珊瑚礁。珊瑚礁通常很擁擠，不允許大魚有很大的空間急轉(zhuǎn)彎。所以這些鯊魚在珊瑚礁外游蕩。

嗯，魚生活在三維世界里，你知道，有各種力量向各個(gè)方向推動(dòng)和拉動(dòng)它。這里所指的力是重力，它將魚向下拉。浮力，在水中保持住它，還有一種叫做阻力的東西。

現(xiàn)在，拖動(dòng)意味著減速，阻礙運(yùn)動(dòng)。這是一個(gè)術(shù)語(yǔ)，適用于任何物體在流體或空氣中運(yùn)動(dòng)時(shí)所受的力。例如，飛機(jī)上的空氣力，阻力，作用是將飛機(jī)拉向與運(yùn)動(dòng)方向相反的方向。

所有這些力，重力，浮力和阻力，如果不是因?yàn)樗鼈円呀?jīng)存在的話，對(duì)魚類來(lái)說(shuō)都可能是危險(xiǎn)的。沒(méi)錯(cuò)，你猜對(duì)了，芬斯。因此，魚鰭可以防止魚滾動(dòng)或翻身。它們穩(wěn)定了魚頭。

魚鰭對(duì)于決定魚的移動(dòng)速度和改變方向至關(guān)重要。一句話，魚鰭可以讓魚在水中有效地移動(dòng)?？梢杂涀。蠖鄶?shù)魚有兩種鰭。

第一種是中間鰭。中間鰭位于魚的中線，如背部的背側(cè)。還有尾鰭，尾鰭。另一種鰭是魚兩側(cè)的成對(duì)鰭。

今天，我們將重點(diǎn)關(guān)注尾鰭。尾鰭，即尾鰭。是大多數(shù)魚類的主要推進(jìn)劑，它使它們前進(jìn)。有些魚有一條寬尾巴，這使魚從站立的位置快速爆發(fā)。這對(duì)于飯后或游泳遠(yuǎn)離捕食者很有用。

你會(huì)發(fā)現(xiàn)快速、長(zhǎng)距離游泳的人有很長(zhǎng)很窄的尾鰭，這是非常有效的?，F(xiàn)在，所有的魚都有尾鰭嗎？不，一點(diǎn)也不。有些海馬和鰻魚沒(méi)有它們也過(guò)得很好。海馬以直立的姿勢(shì)游泳。它看起來(lái)像是站著的，對(duì)吧。所以它在背上有一個(gè)鰭，背鰭，就好像它是尾鰭一樣。

鰻魚其實(shí)不需要游得很快。正如我所說(shuō)，大多數(shù)魚都沒(méi)有尾鰭，但大多數(shù)魚都有尾鰭。我給你們舉兩個(gè)尾鰭的例子，看看它們是如何工作的。可以讓我們看看。我關(guān)注的是金槍魚和黑魚。金槍魚的身體是為了速度而造的，但尾鰭在這里是關(guān)鍵，因?yàn)樗脑铝列螤畹奈舶驮谒袔缀醪粫?huì)產(chǎn)生任何阻力。它甚至可以達(dá)到每小時(shí)60到80公里的高速，這真是太神奇了。

還有一個(gè)非常有趣的黑魚案例，它有一個(gè)圓形的尾鰭。如你所見(jiàn)。在突然爆發(fā)時(shí)，它幾乎像飛機(jī)上的螺旋槳一樣，甚至能發(fā)出爆炸聲。我打賭你從沒(méi)想過(guò)魚翅能做到這一點(diǎn)。你可以看到，當(dāng)魚去抓東西或試圖躲避捕食者時(shí)，這對(duì)它是多么有用。它需要在瞬間加速。

三、Fish Movement托福聽(tīng)力問(wèn)題：

Q1:What is the main purpose of the lecture?

A.To highlight the dangers fish encounter

B.To compare the movement of fish and humans

C.To discuss the function of certain fish fins

D.To show the way in which fish fins have evolved

Q2:According to the professor,what problem do requiem sharks have when swimming?

A.Their large fins cause decreased bouyancy.

B.Their fins do not function well as brakes.

C.They cannot make sharp turns.

D.They are unable to accelerate rapidly.

Q3:How does the professor illustrate the meaning of the term“drag”?

A.By describing the movement of arms and legs

B.By mentioning the case of the propeller

C.By explaining how fish escape from predators

D.By comparing it to the force of air on an airplane

Q4:Why does the professor mention sea horses and eels?

A.To illustrate that not all fish have a caudal fin

B.To give an example of buoyancy

C.To discuss long-distance swimmers

D.To show how long,narrow tail fins function

Q5:According to the professor,what do rounded caudal fins allow the fish to do?

A.To brake more effectively

B.To keep their balance

C.To gain speed rapidly

D.To change direction

Q6:Why does the professor say this:

A.She wants the students to make predictions on the speed of fish.

B.She wants to show how fish communicate with one another.

C.She thinks the students have not read the textbook thoroughly.

D.She wants to convey the extraordinary power of some fins.

四、Fish Movement托福聽(tīng)力答案：

A1:正確答案：C

A2:正確答案：B

A3:正確答案：D

A4:正確答案：A

A5:正確答案：C

A6:正確答案：D

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