初級 美國腔 70010 分類 收藏
開始影片後,點擊或框選字幕可以立即查詢單字
字庫載入中…
回報字幕錯誤
What's the worst bug on the planet?
You might vote for the horsefly or perhaps the wasp, but for many people, the worst offender is by far the mosquito.
The buzzing, the biting, the itching, the mosquito is one of the most commonly detested pests in the world.
In Alaska, swarms of mosquitoes can get so thick
that they actually asphyxiate caribou.
And mosquito-borne diseases kill
millions of people every year.
The scourge that is the mosquito isn't new.
Mosquitoes have been around
for over a hundred million years
and over that time have coevolved
with all sorts of species,
including our own.
There are actually thousands of species
of mosquitoes in the world,
but they all share one insidious quality:
they suck blood, and they're really, really good at sucking blood.
Here's how they do it.
After landing, a mosquito will slather
some saliva onto the victim's skin,
which works like an antiseptic,
numbing the spot so we don't notice their attack.
This is what causes the itchy, red bumps, by the way.
Then the bug will use its serrated mandibles
to carve a little hole in your skin,
allowing it to probe around
with its proboscis,
searching for a blood vessel.
When it hits one,
the lucky parasite can suck
two to three times its weight in blood.
Turns out we don't really like that too much.
In fact, humans hate mosquitoes so much
that we spend billions of dollars worldwide
to keep them away from us --
from citronella candles
to bug sprays
to heavy-duty agricultural pesticides.
But it's not just that mosquitoes are annoying,
they're also deadly.
Mosquitoes can transmit everything
from malaria
to yellow fever
to West Nile virus
to dengue.
Over a million people worldwide
die every year from mosquito-borne diseases,
and that's just people.
Horses, dogs, cats,
they can all get diseases from mosquitoes too.
So, if these bugs are so dastardly,
why don't we just get rid of them?
We are humans after all,
and we're pretty good at getting rid of species.
Well, it's not quite so simple.
Getting rid of the mosquito
removes a food source
for lots of organisms
like frogs and fish and birds.
Without them, plants would lose a pollinator.
But some scientists say
that mosquitoes aren't actually all that important.
If we got rid of them, they argue,
another species would simply take their place
and we'd probably have far fewer deaths from malaria.
The problem is
that nobody knows what would happen
if we killed off all the mosquitoes.
Something better might take their spot
or perhaps something even worse.
The question is,
are we willing to take that risk?
提示:點選文章或是影片下面的字幕單字,可以直接快速翻譯喔!

載入中…

載入中…

【TED-Ed】可惡致命的蚊子 (The loathsome, lethal mosquito - Rose Eveleth)

70010 分類 收藏
VoiceTube 發佈於 2015 年 2 月 23 日
看更多推薦影片
  1. 1. 單字查詢

    在字幕上選取單字即可即時查詢單字喔!

  2. 2. 單句重複播放

    可重複聽取一句單句,加強聽力!

  3. 3. 使用快速鍵

    使用影片快速鍵,讓學習更有效率!

  4. 4. 關閉語言字幕

    進階版練習可關閉字幕純聽英文哦!

  5. 5. 內嵌播放器

    可以將英文字幕學習播放器內嵌到部落格等地方喔

  6. 6. 展開播放器

    可隱藏右方全文及字典欄位,觀看影片更舒適!

  1. 英文聽力測驗

    挑戰字幕英文聽力測驗!

  1. 點擊展開筆記本讓你看的更舒服

  1. UrbanDictionary 俚語字典整合查詢。一般字典查詢不到你滿意的解譯,不妨使用「俚語字典」,或許會讓你有滿意的答案喔