| 单词 | hypoplasia | 
| 释义 | hypoplasianoun  hy·po·pla·sia  ˌhī-pō-ˈplā-zh(ē-)ə    : a condition of arrested development in which an organ or part remains below the normal size or in an immature state    hypoplastic   ˌhī-pō-ˈpla-stik adjective | 
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