对其本人我并不是很了解，但熟悉他的人对我说他是一个非常聪明的人。
I have not ever known him personally, but they say that he is an intelligent person, one who knows his facts.
研究人员也通过对参与者非常熟悉的人进行咨询，如他们的配偶，来了解他们的认知功能。
The researchers also talked to someone who knew each participant well, such as their spouse, to ask about cognitive functioning.
“不熟悉的东西你对它们的回报率会非常悲观，”他说，“因为你不了解，你就觉得风险比较大”。
'you think too pessimistically about the returns on something that's not familiar,' he says. 'Since you don't know about it, you think it's riskier.
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