評(píng)論
打印
Now listen to part of lecture on the topic you just read about.
現(xiàn)在來聽一段關(guān)于你剛剛所讀到的話題的演講。
The cane toad won't be as easy to get rid of as the reading suggests.
海蟾蜍不像閱讀中說的那樣容易擺脫。
The measures proposed by the reading are likely either to be unsuccessful or to cause unwanted environmental damage.
閱讀中所提出的方法可能不是不成功就是會(huì)帶來不必要的環(huán)境損害。
First of all, a national fence probably won't stop the spread of the toad. That's because young toads and toad eggs are found in rivers and streams.
首先，一個(gè)國家性的圍欄并不能阻擋海蟾蜍的傳播。因?yàn)樵诤恿骱拖骼锬苷业接左蛤芎腕蛤艿啊?/div>
No matter where the fence is located, at some point there will be rivers or streams flowing from one side to the other.
不論圍欄放在哪里，在某個(gè)地方總有從一邊流到另一邊的河流和溪流。
These waterways will be able to carry the young toads and their eggs to the other side.
這些水道能把幼蟾蜍和蟾蜍蛋帶到另一邊。
Since it's only necessary for a few young toads or eggs to get through the fence in order to establish population on the other side, the fence is unlikely to be effective.
因?yàn)橹挥猩俨糠值挠左蛤芎腕蛤艿靶枰ㄟ^籬笆來在另一邊生成種群，所以籬笆不可能有效果。
Secondly, a massive group of volunteers could have success trapping and destroying toads.
第二，一大群的志愿者也許能成功地捕獲并摧毀蟾蜍。
But it's likely that these untrained volunteers would inadvertently destroy many of Australia's native frogs. Some of which are endangered.
但是，可能這些沒有經(jīng)過訓(xùn)練的志愿者會(huì)不小心地摧毀澳大利亞本地的青蛙，有些已經(jīng)瀕臨絕種。
It's not always easy to tell the cane toad apart from native frogs especially when it's young.
要從本地青蛙中分辨出海蟾蜍是不容易的，尤其當(dāng)它還小的時(shí)候。
Third, using the virus is a bad idea because it could have terrible consequences for cane toads in their original habitat in Central and South America.
第三，使用病毒是個(gè)壞主意，因?yàn)檫@可能會(huì)給在它們的原始棲息地中部和南部美洲的海蟾蜍帶來可怕的影響。
You might be wondering how can a virus released in Australia cause harm in the Americas.
你也許會(huì)奇怪，在澳大利亞釋放的病毒怎么能在美洲產(chǎn)生危害呢？
Well, Australian reptiles and amphibians are often transported to other continents by researchers or pet collectors for example.
好吧，澳大利亞的爬行動(dòng)物和兩棲動(dòng)物經(jīng)常被運(yùn)到其他的大陸，比如被專家或者寵物收集者。
Once the animals infected by the virus reach Central and South America, the virus will attack the native cane toads and devastate their populations.
一旦被病毒感染的動(dòng)物到達(dá)中部或者南部美洲，病毒便會(huì)攻擊當(dāng)?shù)氐暮ｓ蛤懿⑶覛缢鼈兊姆N群。
That would be an ecological disaster because in the Americas cane toads are a native species and a vital part of the ecosystem.
那將會(huì)是一個(gè)生態(tài)災(zāi)難，因?yàn)樵诿乐蓿ｓ蛤苁且粋€(gè)原生物種，是生態(tài)系統(tǒng)中至關(guān)重要的一部分。
So if they are eliminated, the whole ecosystem will suffer.
所以如果它們被消滅了，整個(gè)生態(tài)系統(tǒng)將遭殃。
