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1. Oxford Dictionary

   developmental delay

   • n.
     the condition of a child being less developed mentally or physically than is normal for its age

   • noun: developmental delay

2. • 釋義

   n.

   名詞

   • 1. the condition of a child being less developed mentally or physically than is normal for its age mercury contributes to many known health problems, including neurological injury, developmental delay, and cerebral palsy