名词
中文翻译：婴儿期
同义词：
['infant stage', 'neonatal period', 'infancy']
例句：
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1. The study of infant mortality has become a hot topic in epidemiology.
婴儿死亡率研究已成为流行病学中的热门话题。
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2. Infantile metopism is a concept that emphasizes the importance of early childhood development.
婴儿期理论强调了早期童年发展的重要性。
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3. Researchers have found that infantile metopism can significantly improve children's cognitive and language development.
研究发现，婴儿期理论可以显著提高儿童的认知和语言发展。