Most often seen in children between 2 and 3 years-old.
这种情况在2到3岁的孩子中最为常见。
Conclusion: Psychological intervention on 2 ~ 3 years old children has confirmative short term effects.
结论：对2 ~ 3岁儿童进行早期心理干预可以取得明确的近期效果。
Solitary play: the child is are completely engrossed in playing and does not seem to notice other children. Most often seen in children between 2 and 3 years-old.
个人的游戏：孩子完全沉浸在自己的游戏中，不会去关注其它的孩子，这种情况在2 - 3岁的孩子中比较多见。
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