Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
아동학은 어린이의 발달을 연구하는 학문입니다.adonghak-eun eorini-ui baldal-eul yeonguhaneun hakmun-imnida.Child study is a discipline that researches the development of children.