Scientists believe that personalitycharacteristics such as friendliness, shyness and fears are not a result of environment.
科学家认为，诸如友善、害羞和胆怯等性格特征不是环境造成的。
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A new study in the Journal of the American Geriatrics Society looked at this question by examining the personalitycharacteristics of 246 children of people who had lived to be at least 100.