形容词
中文翻译：不成熟的
同义词：
['naive', 'primitive']
例句：
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1. The child was so young that he couldn't even walk yet.
这个孩子太小了，还不能走路。
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2. She is very naive and believes everything she hears.
她很天真，相信她听到的一切。
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3. The primitive tribe lived in caves for thousands of years.
原始部落几千年来一直住在洞穴里。