对孤立儿童的个案研究表明，他们缺乏坚定的自我概念，而其语言能力的缺乏严重阻碍了他们的智力和心理发展。
Case studies of children who are isolated from others reveal that they lack a firm self-concept, and their mental and psychological development is severely hindered by lack of language.
根据这个思路，两岁的儿童发展出的语言能力可以使他们对事件的组织方式与婴儿基于动作的组织方式有根本的差异。
According to this line of thought, the verbal abilities that blossom in the two year old allow events to be coded in a form radically different from the action-based codes of the infant.
一些语言发展专家已经将儿童导向的语言划分为不同的阶段。
Some language development experts have characterized child-directed speech in stages.
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