形容词
中文翻译：Unknown
同义词：
['infantile', 'pediatric', 'juvenile']
例句：
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1. The baby's behavior was infantile and frustrating for the parents.
婴儿的行为对父母来说既幼稚又令人沮丧。
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2. The child's infantile play is a sign of healthy development.
孩子的幼稚游戏是健康发育的标志。
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3. The infantile stage of human development is crucial to understanding our evolution.
人类发展的幼稚阶段对于理解我们的进化至关重要。