【正文】
absorbing functions are poor passive immunity gradually diminishes 年齡分期 幼兒期 Toddler Age from 1 to 3 years old Features growth bees slower more activity and more contact with the outer world intelligence development bees faster poor ability to identify danger 年齡分期 學(xué)齡前期 Preschool Age from 3 years old to 67 years old Features growth bees slower, intelligence development bees more mature strong desire of knowledge, imitation of adult’s behavior poor ability to identify danger 年齡分期