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The Ballad

由Alessandra Ancilotto

字根

由Reder Tseng

"A Raisin in the Sun" emotional timeline exemplar

由Adam Frick

Front-end Development

由Bruno García Echegaray

Jean Paget and Lev. Vigotsky

discover how to solve and perform the task themselves

what they still can not achieve on their own.

Intelillence

Proximal development zone

formal operations

the ability to use logic to reach abstract conclusions

concrete operations

use logic classification order conservation

preoperational

symbolic game

sensorimotor

appearance of articulated language

Stages of development