In the 1950s Torreya taxifoha, a type of evergreen tree once very common in the state of Florida, started to die out. No one is sure exactly what caused the decline, but chances are good that if nothing is done, Torreya will soon become extinct. Experts are considering three ways to address the decline of Torreya.
The first option is to reestablish Torreya in the same location in which it thrived for thousands of years. Torreya used to be found in abundance in the northern part of Florida, which has a specific microclimate. A microclimate exists when weather conditions inside a relatively small area differ from the region of which that area is a part. Northern Florida's microclimate is very favorable to Torreya's growth. This microclimate is wetter and cooler than the surrounding region's relatively dry, warm climate. Scientists have been working to plant Torreya seeds in the coolest, dampest areas of the microclimate.
The second option is to move Torreya to an entirely different location, far from its Florida microclimate. Torreya seeds and saplings have been successfully planted and grown in forests further north, where the temperature is significantly cooler. Some scientists believe that Torreya probably thrived in areas much further north in the distant past, so by relocating it now, in a process known as assisted migration, humans would simply be helping Torreya return to an environment that is more suited to its survival.
The third option is to preserve Torreya in research centers. Seeds and saplings can be moved from the wild and preserved in a closely monitored environment where it will be easier for scientists both to protect the species and conduct research on Torreya. This research can then be used to ensure the continued survival of the species.
You’ve just read about three ways to save Torreya taxifolia. Unfortunately, none of these three options provides a satisfactory solution.
About the first solution-reestablishing Torreya in the same location-that’s unlikely to be successful, because of what’s happening to the coolest dampest areas within torreya’s micro-climate. These areas are being strongly affected by changes in the climate of the larger region. This could be because global warming has contributed to an increase in overall temperatures in the region or because wetlands throughout Florida have been drained. Either way, many areas across the region are becoming drier, so it’s unlikely that Torreya would have the conditions it needs to survive anywhere within its original Florida micro-climate.
Now about the second solution, relocating Torreya far from where it currently grows, well, let’s look at what happened when humans helped another tree, the black locust tree, move north to a new environment. When they did this, the black locust tree spread so quickly that it killed off many plants and trees in the new environment, and some of these plants and trees were themselves already in danger of becoming extinct . So assisted migration can have unpredicted outcomes for the new environment.
Third, research centers are probably not a solution either. That’s because the population of Torreya trees that can be kept in the centers will probably not be able to resist diseases. For a population of trees to survive a disease, it needs to be relatively large and it needs to be genetically diverse. Tree populations in the wild usually satisfy those criteria but research centers would simply not have enough capacity to keep a large a diverse population of Torreya trees, so trees in such centers will not be capable of surviving diseases in the long term.
Main points: There are 3 Ways to stop the decline of Torreya.
Sub point 1: Reestablish Torreya in the same location.
Sub point 2: Move Torreya to a new location.
Sub point 3: Preserve Torreya in research centers.
Attitude: Not satisfy.
Sub Point 1: Unlikely to successful. (Changes of climate, warming, areas drier.)
Sub Point 2: Black locust tree killed many plants in new environment. (Already in danger, Unpredictable.
Sub Point 3: Not a solution. (Large and diverse needed, not enough capacity, can’t survive in long term.)
In the reading passage the author describes three ways to address the decline of Torreya. However, the professor doubts the arguments presented in the passage will be effective, stating that none of the three ways will work.
To begin with, the professor points out that the first option mentioned in the passage, reestablishing Torreya in the ecosystem, will not succeed. Why? Many areas within Florida’s microclimate region are becoming drier either from global warming or from disappearing wetlands. Consequently, this region now cannot provide the necessary conditions Torreya needs to survive.
以L的观点起头，谈sub topic 1，在原地区种植T树是不会成功的。因为在Florida的气候发生了变化，原因可能是全球变暖或者湿地消失。现在这片地区已经不能很好的使T树生长了。
Additionally, the professor claims that the second option, relocating Torreya, will be in vain. To illustrate this argument, the professor introduced an example of another tree which was moved to a new environment and then quickly spread to kill off other plant species, including some already-endangered ones.
还是以L观点出发，谈sub topic 2,异地种植T树也不合适。教授举例说，另外一种树在移植后生长太疯狂把别的树包括稀有树木都侵蚀了。
Finally, the professor objects to the third option of preserving Torreya in research centers. The population of Torreya, she explains, has to be genetically diverse in order to resist diseases. Additionally, research centers are very different from the wild and are not able to maintain the necessary size and diversity.
讨论sub topic 3, L说在研究院保护T树也不合适。T树有很多基因分布，研究院没有足够的条件维持这么复杂的，庞大的种群。
1. will be in vain：会徒劳无功
2. Illustrate： 举例说明
The professor illustrated the differences between those two things.