马并不像人们所通常认为的那样是北美土生土长的动物，而是17世纪时征服者由西班牙引进到北美的。
Horses are not, as is commonly thought, native to North America, but were introduced into the country in the 17th century by conquerors form Spain.
最让人忧心的就是这些转移过来的巨型动物可能会毁灭美国西部一些土生土长的动植物。
A big worry is that these transplanted megafauna might devastate plants and animals that are native to the western United States.
最让人忧心的就是这些转移过来的巨型动物可能会毁灭美国西部一些土生土长的动植物。
A big worry is that these transplanted megafauna might devastate plants and animals that are native to the western United States.
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