这个词是什么意思？
The gradual expansion in complexity and meaning of symbols and sounds as perceived and interpreted by the individual through a maturational and learning process. Stages in development include babbling, cooing, word imitation with cognition, and use of short sentences.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D007804 · MeSH 2026。
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