早产儿易于发生呼吸问题、器官发育不全、感染和脑性麻痹。

Premature babies are vulnerable to breathing problems, underdeveloped organs, infections and cerebral palsy.

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退化的，发育不完全的器官退化或发育不全的，尤指其他相关个体或种属；

Vestigial or imperfectly developed, especially in comparison with other individuals or related species;

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