One of the researchers, Dr. Betty Hart, said that the first three years are unique in the lives of humans because infants are so utterly dependent on adults for all their nurture and language.
Mmoja wa watafiti hao, Dk Betty Hart, alisema miaka mitatu ya kwanza ni ya kipekee katika maisha ya binadamu kwa sababu watoto wachanga hutegemea sana watu wazima kwa malezi na lugha zao zote.