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English

In particular, he argues that while animals show lower intelligence than the average human, many severely intellectually challenged humans show equally diminished, if not lower, mental capacity and that some animals have displayed signs of intelligence (for example, primates learning elements of American sign language and other symbolic languages) sometimes on a par with that of human children.

Chinese

他特別指出,雖然動物的智力低於普通人類,但許多嚴重智力挑戰的人類心理能力同樣顯著下降(如果不是更低),並且有些動物表現出智力的跡象(例如,靈長類動物學習美國手語的元素)有時與人類兒童的語言相當。