婴幼儿处于生长发育极其迅速的关键时期。
Infancy is a uniquely vulnerable period of rapid growth and development.
青少年正处在生长发育迅速增长的时期，这个时期的生长发育水平将对其一生的成长起着重要的影响。
Adolescene is at the period of growing rapidly, and the growth level plays an important role in his whole life. Furthermore, the social development is human-oriented.
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