Comparing the intelligence of animals of different species is difficult although there are certain tests and problem sets that have proved to be useful.
比较不同种类的动物之间的智商是一件很困难的事情，虽然有某些测试和问题设置已经证明了很有用。
Comparing the intelligence of animals of different species is difficult although there are certain tests and problem sets that have proved to be useful.
比较不同种类的动物之间的智商是一件很困难的事情，虽然有某些测试和问题设置已经证明了很有用。
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