Scientists have been skeptical of claims of mathematical abilities in animals ever since the case of Clever Hans about 100 years ago.
科学家们，从100年前的Clever Hans事件起，一直对动物有数学能力的说法保持怀疑态度。
The horse's owner convinced people that Clever Hans was psychic when it correctly answered questions by tapping out coded answers with its hoof.
这匹马的主人让大家相信当克里佛·汉斯用蹄子敲打出编码答案而正确地回答出问题的时候，它是有灵魂的。
The horse's owner convinced people that Clever Hans was psychic when it correctly answered questions by tapping out coded answers with its hoof.
这匹马的主人让大家相信当克里佛·汉斯用蹄子敲打出编码答案而正确地回答出问题的时候，它是有灵魂的。
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