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英語六級(jí)聽力考試沖關(guān)訓(xùn)練
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part 1
Scoop That Poop
我好“無辜”的
Actually, dog poop turns out to have a pretty big environmental impact. If you think that two in five households in the U.S. have at least one dog and that about forty percent of Americans don't clean up after their pooches, well, all that poop really adds up. In fact, it's what scientists call the Fido hypothesis.
狗狗便便嚴(yán)重污染環(huán)境。如果美國2/5家庭就養(yǎng)一只狗狗且當(dāng)中大約40%的主人不收拾狗狗的便便。所有這些便便加起來也就是科學(xué)家說的“狗狗”假說。(Fido是對(duì)狗狗通用的稱呼)。
Hey, my dog's name is Fido.
我的'狗狗就叫Fido。
They conjecture that a lot of that waste ends up in waterways. Recent studies, in fact, suggest that dogs are in third or fourth place on the list of contributors to bacteria in water. Talk about gross—fecal matter is full of disease-causing bacteria like E. Coli, salmonella, and giardia.
科學(xué)家推想，水道阻塞的罪魁禍?zhǔn)拙褪沁@些便便。近日有研究表明，造成水里滋生細(xì)菌的“元兇”狗狗排第三或第四。令人作惡的這些細(xì)菌可以致癌，比如：大腸埃希菌、沙門氏菌、鞭毛蟲
Now that bacteria-tracking methods have gotten better, scientists estimate that in some areas, 20 to 30 percent of the bacteria in a stream comes from dogs.
細(xì)菌源追蹤技術(shù)的日臻完善，科學(xué)家估計(jì)，部分地區(qū)20%到30%的細(xì)菌是由狗狗造成的。
Really? That can't be good!
真的嗎?那可不妙!
And the thing is, pollution from dogs is relatively easy to control. All you have to do is scoop when they poop.
其實(shí)，狗狗造成的環(huán)境污染相對(duì)來說很容易避免，你需要做的只是在將狗狗的便便鏟干凈。
part 2
隧道與廣播
How come we can hear FM longer in a tunnel than AM?
為什么在隧道中調(diào)頻廣播比調(diào)幅廣播的信號(hào)要好一點(diǎn)?
It's because FM stations transmit at higher frequencies. They generally go from eighty-eight to one-hundred-and-eight megahertz. That's over a hundred million cycles per second.
這是因?yàn)檎{(diào)頻廣播臺(tái)的`傳播頻率要頻繁些。通常在88到108兆赫。即每秒轉(zhuǎn)1億圈。
As a result, a single radio wave from an FM station is only a few meters long, about the size of a car. An AM station is putting out radio waves that are hundreds of times as long!
因此，調(diào)頻廣播電臺(tái)發(fā)出的一個(gè)電波的長度只有幾米，大概是一輛車的大小。而調(diào)幅廣播站發(fā)出的電波長達(dá)幾百米。
Long wavelengths tend to be absorbed or blocked as they try to enter the smaller tunnel. The higher-energy and shorter-wavelength waves from an FM station aren't absorbed or blocked as much. Instead, they tend to bounce around and get reflected off of surfaces, much like the inside of a tunnel.
在穿越隧道時(shí)，長的波長會(huì)被吞并阻礙。而來自調(diào)頻廣播高能量，波長又短的電波則不會(huì)被吞并或阻礙。相反的，它們會(huì)被隧道表面反射回來。
Of course, they only bounce so far. If the tunnel is long enough, even FM stations fade out until you come out the other end.
當(dāng)然，它們只會(huì)在某個(gè)區(qū)域內(nèi)反彈。如果隧道太長的話，即使是調(diào)頻廣播也會(huì)逐漸變?nèi)踔钡今偝鏊淼馈?/p>
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