动词
中文翻译：未出生的
同义词：
['unborn', 'unformed', 'undeveloped']
例句：
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1.The baby is still unriven, and needs more time to grow.
婴儿还未出生，需要更多时间成长。
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2.The research has shown that the earth's climate has been unriven for millions of years.
研究表明地球的气候已经未出生数百万年。
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3. The scientists were surprised to find that the eggs had not yet unriven.
科学家们惊讶地发现这些蛋还没有孵化。