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Now listen to a part of the lecture on the topic you just read about.
現在來聽一段有關你剛剛讀到的話題的演講。
You've just read about three ways to save Torreya taxifolia.
你們剛剛讀到了三種拯救佛羅里達榧的方法。
Unfortunately, none of these three options provides a satisfactory solution.
很遺憾，這三個選擇里沒有一種是令人滿意的方法。
About the first solution, reestablishing Torreya in the same location.
關于第一個方法，在相同位置恢復香榧樹。
That's unlikely to be successful, because of what's happening to the coolest, dampest areas within Torreya's microclimate.
這不可能會成功，因為香榧樹微環境里最冷最潮濕的地方正在發生著什么。
These areas are being strongly affected by changes in the climate of the larger region.
這些地方被大區域里的氣候變化大大地影響了。
This could be because global warming has contributed to an increasing overall temperatures in the region or because wetlands throughout Florida have been drained.
這可能是因為全球變暖導致了該地區整體溫度的上升，也可能是因為整個佛羅里達地區的濕地都被抽干。
Either way, many areas across the region are becoming drier.
無論是那種原因，該區域的很多地方都變得很更干燥。
So it's unlikely that Torreya would have the conditions it needs to survive anywhere within its original Florida microclimate.
所以在它原始微環境的任何地方，香榧樹都不太可能會有它生存所需要的條件。
Now, about the second solution, relocating Torreya far from where it currently grows?
現在，關于第二個解決方案，把香榧遷移到遠離它目前生長的地方。
Well, let's look at what happened when humans helped another tree, the black locust tree, move north to a new environment.
恩，讓我們看看人類幫助另一種樹--刺槐樹，把它北移到一個新的環境的時候發生了什么。
When they did this, the black locust tree spread so quickly that it killed off many plants and trees in the new environment,
當他們這樣做的時候，刺槐樹蔓延得太快，以至于它消滅了新環境里的許多植物和樹木，
and some of these plants and trees were themselves already in danger of becoming extinct.
并且這些植物和樹木中的一些它們自己已經處于絕種的危險中。
So assisted migration can have unpredicted outcomes for the new environment.
所以，協助遷移對新環境來說會有無法預料的結果。
Third, research centers are probably not a solution either.
第三，試驗中心也可能不是一個解決方法。
That's because the population of the Torreya trees, that can be kept in the centers will probably not be able to resist diseases.
因為能被放在研究中心的香榧樹數量也許不能抵御疾病。
For a population of trees to survive a disease, it needs to be relatively large and it needs to be genetically diverse.
一種樹木想要在疾病中生存，它的數量需要相對大一點，并且需要基因上是多樣的。
Tree populations in the wild usually satisfy those criteria.
在野外的樹木種群通常能滿足這些要求。
But research centers would simply not have enough capacity to keep a large and diverse population of Torreya trees.
但是研究中心沒有足夠的容量來容納大量且多樣的香榧樹。
So trees in such centers will not be capable of surviving diseases in the long term.
所以，長遠來說，在那些中心里的樹不能在疾病中幸存。
